Vaillant F.75 fault on ecoTEC Plus and Pro Boilers explained

Vaillant F.75 fault – Water Pressure Sensor or Pump failure

The Vaillant F.75 fault code showing on the ecoTEC Plus or ecoTEC Pro boiler display, indicates that no pressure rise is being detected by the boiler’s Water Pressure Sensor, when the integral Pump initially starts up into normal running mode.

The displayed F.75 fault code is usually a result of one (of two) integral boiler components becoming defective.

  1. Firstly, it is possible that the ecoTEC boiler’s Pump has failed or is intermittently seizing up.
  2. Secondly (and much more likely), is that the boiler’s Water Pressure Sensor is partially blocked and is not detecting the correct pressure increase from the Pump on startup.

As indicated above, the usual cause of the F.75 failure, 80% of the time, is the Water Pressure Sensor not detecting any pressure increase from the Pump.

This is mainly due to the Sensor becoming blocked up by debris and dirty contaminated system water turning into a form of semi-solid sludge, over time.

The same dirty water, of course, will more than likely be circulating around many other parts in the central heating system.

 

F.75 Vaillant ecoTEC Boiler Fault Code Error
Vaillant ecoTEC Boiler with F.75 Fault Code

 

Glowcare are Vaillant Approved Specialists, covering the Greater Manchester, Cheshire, Liverpool and Lancashire areas.

Many of our customers have experienced their Vaillant ecoTEC boilers playing up with intermittent F.75 issues, due to Water Pressure Sensor failures over the years.

Surprisingly, some of these boilers manage to limp on for a while, intermittently cutting out but not failing completely.

This seems to have been happening because the customers were putting the system pressure up a bit higher, on the boiler’s digital display or pressure gauge.

This action, of course, must not exceed the manufacturer’s specified pressure limits and parameters.

We at Glowcare do not recommend increasing the water pressure in the boiler to get around this problem, and advise that the defective Water Pressure Sensor is replaced as soon as possible.

So this slight pressure increase, sometimes kept boilers from completely failing. But obviously there is a limit to how much customers will want to put up with this, before addressing the Water Pressure Sensor issue, by having it replaced by a competent person, e.g. a Vaillant Specialist or a local Gas Safe Engineer.

 

Taking a look at what the manufacturer says in the Vaillant manual for the F.75 error fault code on the ecoTEC Plus or Pro boiler

Vaillant ecoTEC F.75 Fault Error Code – Plus and Pro Boiler

F.75 Fault Code

Fault Meaning;

Pressure change not detected on Pump starting up.

Causes can be;

Water Pressure Sensor defective

Automatic Air Vent defective

Air within heating system

Not enough water in appliance

Possible by-pass adjustment

Expansion Vessel (external) connected to the return.

 

As has been said previously, it is usually one of two failed components that will be responsible for causing the F.75 fault error code.

  1. In rare instances, the expensive integral boiler Pump.
  2. More likely, the boiler’s Water Pressure Sensor.

 

A hint as to which one, of the two mentioned components, is most likely to be causing the F.75 failure

It is possible that customers may be able to get a useful heads up via the use of the ecoTEC’s user controls, as to whether it is more likely to be the Water Pressure Sensor or the Pump, that is the cause of the F.75 fault.

Restart the boiler by pressing the reset button. On older (pre-2012) ecoTEC boiler models this is the top left-hand of four buttons located underneath the digital display. On the later ecoTEC 2 boiler (2012 onwards), it is the round button found underneath the four oblong-shaped buttons below the boiler’s display.

After the F.75 code disappears from the display and four short separated buzzing noises are heard as the boiler is going through the pre-firing up procedure, there may be an opportunity to glean whether it is the boiler’s Water Pressure Sensor, or the Pump, that is the responsible part for the F.75 fault.

 

Water Pressure Sensor

Shortly after pressing the reset button and with the boiler attempting to fire up, if the boiler is making similar noises and actions to that described in the sequence below, in all probability (not guaranteed) it will be the (less expensive) Water Pressure Sensor that is the faulty part, responsible for the F.75 fault.

The Pump is heard circulating water continuously through the boiler for between 10-20 seconds before stopping, the boiler then goes quiet for about 8-12 seconds. This action is then repeated, with the Pump heard running, and then stopping for a total of about 5 times. Finally, all goes completely quiet, then after a further 30 seconds or so the F.75 code appears on the boiler’s display.

 

Vaillant ecoTEC Water Pressure Sensor F.75 Fault
Vaillant ecoTEC Water Pressure Sensor

 

Boiler Pump

If however, the boiler’s Pump has failed, this time, after the ecoTEC’s reset button has been pressed, it is possible that one of two different sequences will be observed.

In each of these two separate sequences, it is not pumping water that you can hear, but rather a faint humming type noise, this is due to the Pump being seized up and not rotating.

What is usually heard when the pump has failed, is either:

  1. A very faint continuous humming noise, lasting for a period of around 10-20 seconds, before the noise stops, then there is no noise at all for the next 8-10 seconds. This sequence repeats about 5 or 6 times in total, before the F.75 code appears on the boiler’s display screen.
  2. One long continuous faint humming noise comes from the boiler, nothing else is heard, eventually the F.75 code is displayed on the boiler. The continuous humming noise that can be heard in this “failed Pump” scenario, is caused by the Pump’s impeller in all likelihood becoming seized up or jammed. This makes the Pump get very hot, in turn giving out a faint humming type noise. A new Pump may be required if it is completely seized up.

 

Vaillant ecoTEC Boiler Pump for F.75 Fault Code
Vaillant ecoTEC Boiler Pump

 

 

Vaillant F.75 Fault Error Code Failure – Repairers and Costs

Who can repair this and what are the costs?

An approach that many customers have found to their advantage when first contemplating the repair of their troublesome and recurring F.75 problem, is to have a very detailed look at the different amounts charged by the various companies for a completed repair of the F.75 fault.

There are many different prices, rates and formats out there, from the big nationals, to the manufacturer, by the independent Vaillant specialist, or the local Gas Safe Registered engineer, and so on.

So it really makes good sense to drill down and work out what is going to be the best and most cost-effective option.

From a financial perspective, the price that can be paid for the F.75 repair can vary widely. It can cost anywhere up to around £300 (this being the most expensive example hopefully), where the Pump is broken and needs to be replaced.

At the other end of the scale, it could cost considerably less, possibly in the region of £110-£140 with some of the smaller operators, where it is the inexpensive Water Pressure Sensor that has failed, and is solely responsible for the F.75 breakdown.

It is worth explaining that some of the larger national companies operate what is called a “fixed price repair” charge, which includes all labour and any parts that are needed to complete the repair. This can present a reasonable option if the expensive Pump has failed, resulting in the breakdown.

However, the fixed price way of proceeding may not seem such a good choice if just the relatively inexpensive Water Pressure Sensor is the cause of the F.75 failure.

The actual cost of the replacement Water Pressure Sensor is only around £30 to £40.

So alternatively, using a Vaillant specialist, providing a sensibly-priced one-off labour charge to replace the Water Pressure Sensor, thus resolving the F.75 problem, would seem a better proposition.

Getting the repair done this way, by finding a local Vaillant boiler repair specialist, such as ourselves Glowcare (in the North West of England), could prove a much more cost-effective way to approach the F.75 fault code repair.

 


 

Additional Information

If your specific Vaillant boiler model is listed below, then the Water Pressure Sensor (0020059717) should be the correct replacement part number.

If, however, the Vaillant F.75 fault is due to Pump failure, then it is really important to identify the correct Vaillant boiler model.

This is because there are different types of both Grundfos and Wilo Pumps, used on various boiler models.

If the specific boiler model is known, there shouldn’t be too much confusion on which is the correct Pump required.

 

Vaillant ecoTEC pro 24  VUW GB 246/3-3

Vaillant ecoTEC pro 28  VUW GB 286/3-3

Vaillant ecoTEC pro 24  VUW 246/5-3 (H-GB) 

Vaillant ecoTEC pro 28  VUW 286/5-3 (H-GB) 

Vaillant ecoTEC pro 28  VUW 286/5-3 (P-GB)

Vaillant ecoTEC pro 28  VUW GB 286/5-3 H

Vaillant ecoTEC pro 28  VUW GB 286/5-3 P

Vaillant ecoTEC pro 28  VUW GB 286/5-3 A

Vaillant ecoTEC pro 28  VUW 286/5-3 A LPG

Vaillant ecoTEC pro 30  VUW GB 306/5-3

Vaillant ecoTEC plus 612  VU GB 126/3-5  

Vaillant ecoTEC plus 615  VU GB 156/3-5 

Vaillant ecoTEC plus 618  VU GB 186/3-5 (H-Gas)

Vaillant ecoTEC plus 618  VU GB 186/3-5 (P-Gas)

Vaillant ecoTEC plus 612  VU GB 126/5-5  

Vaillant ecoTEC plus 612  VU GB 126/5-5 A

Vaillant ecoTEC plus 615  VU GB 156/5-5

Vaillant ecoTEC plus 615  VU 156/5-5 (H-GB)

Vaillant ecoTEC plus 615  VU GB 156/5-5 A

Vaillant ecoTEC plus 618  VU 186/5-5 (H-GB)

Vaillant ecoTEC plus 618  VU 186/5-5 (P-GB)

Vaillant ecoTEC plus 618  VU GB 186/5-5 H 

Vaillant ecoTEC plus 618  VU GB 186/5-5 A

Vaillant ecoTEC plus 618  VU GB 186/5-5 P

Vaillant ecoTEC plus 618  VU GB 186/5-5 A LPG

Vaillant ecoTEC plus 624  VU GB 246/3-5 

Vaillant ecoTEC plus 630  VU GB 306/3-5 (H-Gas) 

Vaillant ecoTEC plus 630  VU GB 306/3-5 (P-Gas)

Vaillant ecoTEC plus 637  VU GB 376/3-5  

Vaillant ecoTEC plus 624  VU 246/5-5 (H-GB) 

Vaillant ecoTEC plus 624  VU GB 246/5-5 

Vaillant ecoTEC plus 624  VU GB 246/5-5 A 

Vaillant ecoTEC plus 630  VU 306/5-5 (H-GB) 

Vaillant ecoTEC plus 630  VU 306/5-5 (P-GB) 

Vaillant ecoTEC plus 630  VU GB 306/5-5 H

Vaillant ecoTEC plus 630  VU GB 306/5-5 P

Vaillant ecoTEC plus 630  VU GB 306/5-5 A

Vaillant ecoTEC plus 630  VU GB 306/5-5 A LPG

Vaillant ecoTEC plus 637  VU GB 376/5-5 

Vaillant ecoTEC plus 637  VU GB 376/5-5 A

Vaillant ecoTEC plus 637  VU 386/5-5 (H-GB)

Vaillant ecoTEC plus 824  VUW GB 246/3-5

Vaillant ecoTEC plus 831  VUW GB 316/3-5 (H-Gas) 

Vaillant ecoTEC plus 831  VUW GB 316/3-5 (P-Gas)

 

Vaillant ecoTEC plus 824  VUW 246/5-5 (H-GB)

Vaillant ecoTEC plus 825  VUW 196/5-5 (H-GB)

Vaillant ecoTEC plus 825  VUW GB 256/5-5

Vaillant ecoTEC plus 831   VUW  GB 316/5-5 H

Vaillant ecoTEC plus 831   VUW  GB 316/5-5 P

Vaillant ecoTEC plus 832  VUW 246/5-5 (H-GB)

Vaillant ecoTEC plus 832  VUW 246/5-5 (P-GB)

Vaillant ecoTEC plus 832  VUW GB 326/5-5 

Vaillant ecoTEC plus 832  VUW GB 326/5-5 (LPG)

Vaillant ecoTEC plus 835  VUW  306/5-5 (H-GB)

Vaillant ecoTEC plus 835  VUW  GB 356/5-5 

Vaillant ecoTEC plus 837  VUW  GB 376/5-5

Vaillant ecoTEC plus 838  VUW  286/5-5 (H-GB)

Vaillant ecoTEC plus 838  VUW  GB 386/5-5

Vaillant ecoTEC plus 837  VUW GB 376/3-5 

Vaillant ecoTEC plus 937  VUI GB 376/3-5 

Vaillant ecoTEC plus 937  VUI GB 376/5-5 

Vaillant ecoTEC plus 937  VUI GB 386/5-5 A

Vaillant ecoTEC plus 938  VUI 286/5-5 (H-GB)

Vaillant ecoTEC exclusive 832  VUW GB 326/4-7 H 

Vaillant ecoTEC exclusive 838  VUW GB 386/4-7 H 

Vaillant ecoTEC pure  VU 286/7-2 (GB)

Vaillant ecoTEC pure  VU 346/7-2 (GB)

Vaillant ecoTEC sustain  VUW 286/7-2 (H-GB)

Vaillant ecoTEC sustain  VUW 346/7-2 (H-GB)

Vaillant Home Combi 25  Home combi 25 -A (H-GB)

Vaillant Home Combi 30  Home combi 30 -A (H-GB)

Vaillant Home Combi 35  Home combi 35 -A (H-GB)

Vaillant Home system 12  Home system 12 -A (H-GB)

Vaillant Home system 15  Home system 15 -A (H-GB)

Vaillant Home system 18  Home system 12 -A (H-GB)

Vaillant Home system 25  Home system 25 -A (H-GB)


Vaillant F.62 fault explained and how best to get it resolved

Vaillant ecoTEC F.62 fault – 6 key questions

This Vaillant ecoTEC F.62 fault blog, deals with 6 key questions concerning the F.62 fault error code. We look at who, ideally, should carry out the repair and why.

Our focus is on four key factors; The PCB, The Gas Valve, Specialists who carry Vaillant parts, and other companies who may not carry a stock of Vaillant parts.

 

Vaillant ecoTEC Boiler Fault Code F.62

 

1. What is a Vaillant fault code of F.62?

When a F.62 fault code is triggered, as well as stopping the boiler from operating any further, the error code message also informs that a specific fault or problem has occurred in the boiler.

 

2. What fault does a F.62 error code specifically point to?

When a fault error code of F.62 flashes, or is shown on the digital display screen of a Vaillant ecoTEC plus or pro combi or system boiler, it usually means that a fault has developed in either one of two integral boiler parts; the PCB (printed circuit board) or the Gas Valve.

 

3. Which Vaillant ecoTEC models get F.62 problems?

Most Vaillant ecoTEC plus and pro boilers can experience a problem with F.62 failure. As Vaillant specialists who carry out ecoTEC boiler repairs and services on a daily basis, we find that the majority of F.62 fault error codes occur on the earlier Vaillant ecoTEC pro and plus R1 boilers. These first ecoTECs were produced from 2005 to 2012. This F.62 issue on these older R1 models (normally at least 10 years old), is much more prevalent than on the later updated ecoTECs (or “ecoTEC 2”), which have been produced since 2012.

 

4. Why does the F.62 fault occur intermittently?

When the Vaillant ecoTEC plus and pro boilers get around (or beyond) 10 years old, defects in certain components can occasionally develop. It is these developing faults (in either the PCB or the Gas Valve) that are responsible for the boiler starting to fail intermittently, with the F.62 fault error code.

Customers will often contact us saying that the water goes cold when their shower is being used. When they check the digital display on the ecoTEC boiler it is showing a F.62 fault error code. They often go on to say, that they can reset the boiler again and the hot water returns for a short while, but the intermittent failure keeps coming back!

It is worth pointing out that in the same way the F.62 fault code starts to intermittently appear, a similar pattern also appears with other related Vaillant fault codes of F.27, F.61, F.63, F.64, F.65 & F.67.

 

5. Will constant F.62 resetting, damage the ecoTEC?

No, the boiler will just keep on being able to be reset, until ultimately the part in the boiler will fail.

 

6. What information is there on how to fix the F.62 fault?

There is written information from Vaillant covering the F.62 fault code, but NOT how to fix it, for obvious reasons!
This information is in the “Troubleshooting” section of the Vaillant ecoTEC boiler installation and servicing book, under “Error Codes”. The book refers to the “Meaning” of the F.62 code as “Gas Valve Shutoff Delay”, referring to the “Cause” it says “Gas Valve Leaking, Electronics Defective”.

It may well be that the Gas Valve is defective, however, in our experience it is a faulty PCB component which needs replacing, in the majority of cases, to rectify the problem.

 

Vaillant ecoTEC Boiler - PCB - F.62 Fault

 

Only a Gas Safe Registered engineer/installer, who holds the appropriate qualification, is legally allowed to work on a Gas boiler.

 

What to consider when choosing who should fix a Vaillant F.62 fault?

So, with the above having been explained, what approaches are there when exploring the subject of getting the Vaillant F.62 fault resolved?

Usually, there are two different approaches that customers take, when trying to get a F.62 fault error code repaired on their Vaillant ecoTEC plus/pro combi or system boilers. These are to use any Gas Safe Registered business that is qualified to work on boilers, or use a dedicated Vaillant repair specialist who serves your area.

In an ideal world, it would be great to get the Vaillant F.62 fault fixed professionally, in a single visit, without wasting time and money.

To be honest, no engineer can truly know for sure which is the defective part (or parts) causing the F.62 fault, until they attend the repair.
In fact, you don’t actually know whether it is the PCB or the Gas Valve that is the defective part, until one of those two parts has been replaced and the boiler is back up and working again.

 

So the PCB or the Valve?

In Vaillant’s ecoTEC installation and servicing instructions, the boilers Gas Valve is referred to first as a possible cause of the F.62 fault.

However, in our experience as Vaillant’s agent, we find it’s usually the PCB (9 times out of 10) that needs changing.

So, it could be that the PCB (as it is most times) is causing the F.62 fault, but it can also be the Gas Valve that is the defective component causing the failure!

In some circumstances, it can even be that both parts are faulty and have to be replaced (but thankfully this is very rare).

Also, Vaillant F.62 issues can sometimes involve the Ignition Cable and/or the Electrode as well.

 

Vaillant ecoTEC Boiler - Gas Valve

 

Given that it is not usually possible to know for definite if the PCB or Gas Valve is causing the fault until the defective part is removed and replaced, if a local or national company (who could work on many different boiler makes) attends the Vaillant repair, they (not being Vaillant specialists) may need to leave the job once or twice to purchase Vaillant parts for the repair, as they may not carry many parts for the ecoTEC model in question.

These parts may also not necessarily be stocked at the local merchant, and would need to be ordered in, possibly adding additional time and cost to the repair.
Also, the customer may be being charged by the hour for the repair, which could prove costly if diagnosing the problem is a lengthy procedure. Trips to the parts merchant to purchase or order parts all take time.

The Vaillant Specialist on the other hand, being familiar as an expert on the entire ecoTEC boiler range, would not usually take too much time in pinpointing the exact problem! The required part would be carried as van stock, so no delay in the repair.
There is also the benefit that a specialist would probably use a “one-off labour price” type charge.

 

Vaillant Parts Carried?

The benefit of using a Vaillant Specialist, is the certainty of the extensive range of genuine Vaillant parts that would be carried.
This means that in the vast majority of cases a successful repair is achieved on any Vaillant boiler, given that they would normally carry around 95% of all the parts for the ecoTEC boiler range, also enabling them to change more than one part if necessary.
There is also the benefit that a specialist would probably use a “one-off labour price” type charge.

Deciding who to use for any boiler repair is often not straightforward at the best of times, in regard to cost, reputation, knowledge and convenience.

Do give plenty of thought and consideration to who you’re going to use for your Vaillant ecoTEC boiler’s F.62 repair.

Some customers we visit can still painfully recount, costly and frustrating previous experiences they’ve had, after choosing the wrong company for their boiler repair!


Glow-worm F11, F12, F13 & F14 Boiler Fault Codes Explained

F11, F12, F13 & F14 Fault Codes on Glow-worm 24, 30, 38 CXI, HXI & SXI Boilers Explained

 

Glow-worm F11, F12, F13 & F14 fault code failure problems occur unfortunately, on a small number of 24, 30 & 38, CXI, HXI & SXI combi or system boilers. This is typically when they get to about 10 years old or older.

At Glowcare (being Glow-worm’s service agent for the North West of England since 1992), we do come across our fair share of F11, F12, F13 & F14 fault code issues, occurring within the Glow-worm CXI, HXI & SXI boiler model range.

These Glow-worm combi and system boiler fault error code problems typically come to our attention with a customer contacting us and explaining that their boiler has failed and can’t be reset. The fault code on the boiler’s digital display is flashing and is showing a F11, F12, F13 or F14 fault code. They go on to explain, that even though they’ve made many repeated attempts to reset the boiler by turning it off and on, the boiler will just not restart at all!

So, when the customer contacts us at Glowcare, their local Gas Safe installer may well have already attended the repair first, and established that there is 230 volts supply to the boiler and that the boiler’s gas and water pressures are all correct.
Establishing this, may lead the installer to conclude that there is nothing further that he or she can do to get the boiler working again, i.e. the boiler has gas and power, but there is still no heat or hot water and the boiler is just displaying either an F11, F12, F13 or F14 fault code.

The installer at this point will often judge that the customer will probably be best served by calling in an approved Glow-worm service agent, such as ourselves. Understanding that Glowcare, as Glow-worm agents, will be carrying at least 95% of any spare parts needed for repairs to the CXI, HXI or SXI with them, ensuring that the customer’s Glow-worm boiler gets expertly repaired and up and running in just one single visit.

 

Possible causes of the F11, F12, F13 & F14 fault error codes.

 

Glow-worm in their installation and service manual for the 24, 30 & 38, CXI, HXI & SXI, combi and system boilers, lists the following faults as:

Fault code of F11, the description says Main PCB, caused by a wiring problem between the User PCB and the Main board.

Fault code of F12, is described as User interface fault, caused by a wiring fault between the two User and Main PCBs.

Fault code of F13, this is described as a PCB (Main) connections fault, due to the wiring, or connections.

Fault code of F14, says the boiler’s Central Heating temperature on flow exceeds 95 degrees C, due to either a system fault, possible pump failure, or the thermistor needs to be checked on flow.

Looking at the four fault codes listed above, and taking the F11 fault error for example, it is of course possible, that the F11 fault lies within these wiring connections, between the User PCB and Main PCB board. All connections then, and the wiring block connectors on both of the two PCB boards, will need to be closely inspected and tested, to establish if the fault is on the wiring connections.

Work of this type can only be carried out by a Gas Safe registered engineer/installer, or a suitably qualified competent person, who is legally permitted to work on this type and model of Gas boiler.

However, it should be pointed out (as Glow-worm specialists), that there will be, in our experience, a good chance that the boiler’s main PCB may need to be replaced to resolve the problem with the F11 fault code!

The PCB, we find, usually causes the F11 fault and also can be the cause of additional fault codes F12, F13 & F14 on the CXI, HXI & SXI boilers as well.

Blank display screen failure, on CXI, HXI & SXI boilers, can result after F11, F12, F13 or F14, have been encountered.

Another related fault code display/PCB issue worth mentioning, and that our customers at Glowcare regularly contact us about (regarding their CXI, HXI or SXI), is that their boiler’s digital display is just rapidly flashing random numbers continuously, stuck in that mode all the time, and the boiler is obviously not working!

 

Glow-worm F11, F12, F13 and F14 Fault Codes, including blank display screen, for Glow-worm CXI, HXI and SXI Boilers.

 

Recently, one of our Glowcare customers contacted us, due to strange and unusual behaviour occurring with their 13 year old Glow worm 30 CXI boiler’s display, after returning home from a holiday. Prior to their holiday the boiler had been isolated (for safety reasons) and on return they turned it back on. The boiler’s display screen started stuttering, frantically displaying random numbers before going completely blank and “the boiler’s dead!”, no heating, no hot water.
Is your boiler experiencing the exact same issue?

Glowcare have always, and still advise customers to err on the side of caution, and make sure to turn off and isolate all Gas boilers when going away on holiday or vacation.

Sometimes when the boiler’s on-off knob/switch is turned off, the blank screen problem (caused by PCB failure) can occur, when the boiler is switched back on again. This very rarely happens but may still result in the PCB needing to be replaced.

An unfortunate failure of a CXI, HXI or SXI boiler’s PCB can happen at any time in the life of the boiler.

The failure that our customer experienced, is quite a rare occurrence, and safety we say must always comes first.


Vaillant Boiler F.61, F.62, F.63, F.64 & F.27, Fault Code Errors, PCB & Gas Valve Problems

Vaillant F.61, F.62, F.63, F.64 & F.27 ecoTEC Fault Code, Gas Valve, and PCB Issues

 

F.61, F.62, F.63, F.64, and F.27 Vaillant Boiler fault Error Code Common Q&As

 

Listed here are our Top 10 F.61, F.62, F.63, F.64 & F.27 Fault code Q&As for the Vaillant ecoTEC Plus & Pro Boiler from Vaillant’s agent Glowcare

 

Q1)  Why does our Vaillant boiler keep intermittently failing and showing an F.61 fault code?

Q2)  When the F.61 fault error code shows and our Vaillant boiler shuts down, why is it that it’s always when someone is having a shower?

Q3)  Will continually resetting the boiler for any of the fault error codes F.61, F.62, F.63, F.64 or F.27 cause further problems with our Vaillant ecoTEC boiler?

Q4)  How would a Gas Safe Registered engineer know what parts were defective in the boiler, and which ones would require replacing to resolve an F.62 fault code problem?

Q5)  Can you explain a bit more about a malfunction between the Gas valve and PCB’s operation?

Q6)  I’m getting an F.63 fault code, but I’ve had F.61, F.62 & F.64 fault codes previously, could they all be linked to the same defect?

Q7)  If the engineer’s diagnosis points to a PCB or Gas valve replacement, will they have to order parts?

Q8)  What other F. codes can show, when either the PCB or Gas valve are intermittently failing, as with my F.27 fault?

Q9)  Can repeated resetting of our Vaillant boiler for an F.64 fault code increase the risk from Carbon monoxide (CO) poisoning?

Q10)  Is it not as expensive to replace a faulty PCB on the older Vaillant 2005-2012 R1 & R2 ecoTEC, as it is on the later ecoTEC 2 plus & pro boilers?

 

Vaillant ecoTEC Boiler. Vaillant Boiler F.61, F.62, F.63, F.64, & F.27, Fault Code Error - PCB

 

Q1)  Why does our Vaillant boiler keep intermittently failing and showing an F.61 fault code?

The F.61 fault code error appearing regularly on your boiler’s digital display screen, which then makes the boiler cut out and stop working, is happening because there’s an ongoing intermittent technical problem or failure occurring when the ecoTEC plus or pro is in its operation mode.

When the reset button is pressed in (on the control panel), the F.61 fault error code clears, and the boiler will commence it’s operation once again, but unfortunately only to trip-out again, after a short period of time.

This is because the fault in the boiler has not been resolved, so the cycle of the boiler going to F.61 fairly frequently, just continues.

 

Q2)  When the F.61 fault error code shows and our Vaillant boiler shuts down, why is it that it’s always when someone is having a shower?

When your boiler is in full operation mode and the shower is in use, or when hot water is being drawn off, for example, the boiler will be running at, or very close to, it’s maximum operating capacity, this would trigger in most instances, the F.61 fault error.

Customers do seem to report most instances of the F.61 problem happening when the shower is being used, more so than reports of the fault code occurring when the boiler is in it’s heating mode.

 

Q3)  Will continually resetting the boiler for any of the fault error codes F.61, F.62, F.63, F.64 or F.27 cause further problems with our Vaillant ecoTEC boiler?

Constantly resetting the boiler after a fault error code shuts off the boiler and is not recommended therefore, if this action is continued, it could possibly bring other problems into play, as well as safety issues.

Our best advice is, if any of the F.61, F.62, F.63, F.64, or F.27 fault codes appear on your ecoTEC combi boiler, the boiler needs repairing by a professional Vaillant specialist company, preferably on a one-off fixed price repair and should be completed as soon as possible.

 

Q4)  How would a Gas Safe Registered engineer know what parts were defective in the boiler, and which ones would require replacing to resolve an F.62 fault code problem?

Vaillant includes in their manual, for the fault code of F.62 on the ecoTEC plus or pro boiler, a listed fault of’ “Gas valve shutoff delay” for this, which is returned for that specific F.62 fault code issue.

A starting point for competent Gas service engineers would probably be to carry out component testing procedures, starting with the Gas valve, which would be to check for defects within that component.

There may also be a need to examine further, other components within the boiler, such as the PCB, (printed circuit board) if that was suspected in any way of being faulty.

This procedure would continue until the defective part or parts in the boiler were identified and if needed, replaced.

 

Q5)  Can you explain a bit more about a malfunction between the Gas valve and PCB’s operation?

Integral boiler components such as the Gas valve and PCB, can develop faulty wiring connections between each of the two parts and can make the boiler stop working.

So this malfunction must only be investigated by a competent and suitably qualified engineer, who may look to see if the fault is being caused by a short circuit defect in the wiring harness to the Gas valve.

Another possibility is that the Gas valve coils may be defective, which would cause the Gas valve to leak to earth (ground), causing a failure or the problem/issue could involve the boiler’s electronic control system.

Any of these suggested defects could be responsible for the boiler going to fault error code. We, at Glowcare find, more often than not, that it’s a faulty PCB causing the problems or failure.

Expertise, knowledge and thorough know-how are always important. Make sure you consult an experienced service engineer when thinking about repairs to your Vaillant ecoTEC plus or pro boiler.

 

Q6)  I’m getting an F.63 fault code, but I’ve had F.61, F.62 & F.64 fault codes previously, could they all be linked to the same defect?

The actual cause of your boiler’s specific F.63 fault code error, should come to light once a suitably qualified Gas service technician carries out a thorough and detailed fault diagnosis of your Vaillant ecoTEC.

Plus or pro boilers with intermittent failure, displaying either an F.61, F.62, F.63 or F.64 fault code error, can possibly all be displayed separately and at different times, but the cause can have resulted, from a single fault or possibly one defective component.

We ourselves find that, in the main, if a customer’s boiler has either a fault error of F61, F62, F63, F64 or F27, that a part replacement repair will, more than not, be required.

Diagnosing the fault would initially start by identifying any defects on the PCB (printed circuit board), or if the PCB is functioning correctly, then the Gas valve would be tested next to check if this component was the source of the F code issues.

If neither the PCB or Gas valve are defective, then in some cases (rarely though) it can involve the boiler’s electrode or ignition cable, or their wiring connections found to be causing these fault code problems.

 

Q7)  If the engineer’s diagnosis points to a PCB or Gas valve replacement, will they have to order parts?

Many boiler repair companies who attend Vaillant ecoTEC pro or plus repairs or breakdowns, in their locality, may not necessarily be carrying the actual PCB (example part number 0020132764) or Gas valve you would need to get the boiler fixed and working again, unfortunately!

So, if this is the case, any replacement parts that would be required to complete the repair, may well have to be scheduled in for a return visit, at another time.

We at Glowcare are specialists for Vaillant boilers. We are a Vaillant UK official service agency for North West England, so as you would expect, we carry a full dedicated van stock of genuine Vaillant spare parts for the Vaillant ecoTEC plus & pro boiler range, ensuring for our customers that their boiler repair gets completed in just a single visit.

 

Q8)  What other F. codes can show, when either the PCB or Gas valve are intermittently failing, as with my F.27 fault?

It is possible to see any one of these fault codes, F.61, F.62, F.63, F.64, F.65 & F.67 singularly, each being a separate fault, and over time, related to a faulty Vaillant PCB or leaking Gas valve.

It can be a fault code error of F.27 (as with your fault), listed as a flame sensing issue, to fault codes of: F.61, Gas valve control defective, F.62, Gas valve shutoff delay, F.63, EEPROM error, F.64, Electronics/NTC fault, F.65, Electronics temperature too high, and F.67, code listed as Flame detector input signal is outside the limits (0 or 5 V).

All can be displayed on the Vaillant ecoTEC plus or pro boilers, mostly involving the PCB or the Gas valve causing the F fault code error/problem.

 

Q9)  Can repeated resetting of our Vaillant boiler for an F.64 fault code increase the risk from Carbon monoxide (CO) poisoning?

Your ecoTEC is designed so an F.64 fault code error can be reset easily and safely. It also doesn’t indicate anywhere, that increased pressing of the reset button will lead to Carbon monoxide (CO) being produced. However, the technical issue or fault that’s causing the increased need to reset your boiler, should be investigated urgently.

So provided your Vaillant’s maintenance schedule procedures are adhered to, by having an Annual Service carried out on your boiler, frequent resetting should not increase the risk from Carbon monoxide (CO) poisoning.

Because Carbon monoxide (CO) has no smell, can’t be seen, and has no taste, if it escapes into the atmosphere it can rise to lethal levels within minutes, causing death. If not fatal, it can cause people who are exposed and poisoned by it, to require emergency treatment in hospital.

Carbon monoxide (CO) is not called the silent killer for nothing. With this in mind, good, regular servicing of your Gas boiler and the installation of appropriately positioned (CO) alarms are strongly advised.

 

Q10)  Is it not as expensive to replace a faulty PCB on the older Vaillant (2005-2012) R1 & R2 ecoTEC boilers, as it is on the later ecoTEC 2 plus & pro boilers?

Yes that’s right, the pre-2012 Vaillant ecoTEC R1 PCB, part number 0020132764 (which superseded part number 0020107811), is about 10-20% cheaper to buy than the latest PCB on the ecoTEC 2 plus or pro boiler, PCB part number 0020254533 (which superseded part number 0020135165).

As for who to use for your boiler repair, if you choose wisely and call a Vaillant service specialist, they will be able to carry out a single visit, expert repair on your boiler.  They will carry with them the PCB needed for the repair as van stock, using Genuine Vaillant spare parts. Also with paying for a fixed price one-off repair, you will know soon after the engineer’s arrival, the complete cost of the repair.

The other repair option, would be to call a local boiler engineer, and see how their charges work (remembering that they may well have to go away to purchase the PCB, and return later to fit the part, which would probably increase the total cost of the repair).

Bearing this in mind, the cost and the convenience of the repair, would probably favour the Vaillant specialist engineer.


Vaillant Boiler Annual Service Cost

Vaillant Boiler Service Cost?

What is the cost of a Vaillant service for Vaillant ecoTEC plus or pro boilers? It should be very achievable for under £70 anywhere in the UK.

Whether it is for your Vaillant boiler Warranty Qualifying Service (which you need to have carried out at the end of each year, to keep your Vaillant ecoTEC’s guarantee valid), or it is just maybe that it’s time for the boiler’s annual service.

Providing there are no faults with your Vaillant, and it’s all working fine (i.e. no problems with the heating or hot water), then a straightforward boiler service (no parts needed) under £70 as a maximum price, is definitely achievable.

Glowcare carry-out annual servicing for the Vaillant ecoTEC plus and pro boiler range, in Greater Manchester, Cheshire, Liverpool, and surrounding areas.


Leaking Vaillant ecoTEC plus and pro Diverter Valves

Firstly, in our experience (covering North West England since 1992) a leak on a Vaillant Diverter valve ecoTEC plus or ecoTEC pro boiler, is actually quite a rare fault or failure to have, taking into consideration just how many ecoTECs there are actually out there!
This is contrary to what we are led to believe.

Now, I know, if your own boiler is suffering from this concerning problem and water is dripping out of the Diverter valve down on to your work surface, well you will probably, find this very hard to understand.
There are possibly many hundreds of thousands of Vaillant ecoTEC combi boilers out there, and only a very small fraction, of these excellent boilers actually ever develop a leaking fault from the Diverter valve!

Vaillant ecoTEC Diverter Valve

We here at Glowcare, being Vaillant’s North West service agent for Gt Manchester, Cheshire and surrounding areas for over 20 years, have found that approximately over 95% of the ecoTEC boilers, never develop a leak on the Diverter valve, confirming that the valve itself is not the real cause of the problem. So if the valve is fine under normal circumstances, what’s causing these few to leak?

In our experienced opinion, it is more or less always the case, that dirty, contaminated water in the heating system causes a brown coloured staining to appear on the piston rod in the Diverter valve.
This allows system water over time to drip past the small O-ring seal in the valve resulting in the leak.

Sometimes, when carrying out an Annual Service on a Vaillant ecoTEC plus or ecoTEC pro boiler, if the water in the customer’s heating system is contaminated or contains very dirty water, the brown staining marking on the Diverter valve piston rod, may well have already begun to show, but not have yet started to leak past the valve O-ring seal.

In our opinion, the black plastic-bodied ecoTEC Diverter valves (out of the two different types of valve) probably get more leaking problems with them, than the brass valves do. The plastic-bodied valves are mostly fitted in the Vaillant ecoTEC pro 24 and ecoTEC pro 28 boiler models, with the ecoTEC plus using both types of valves, on different models within the plus range. The plastic valve typically being on the smaller ecoTEC plus 824 and ecoTEC plus 831, with the brass valve being used on the bigger kW outputted ecoTEC plus 837 and ecoTEC plus 937. There are some other variations to this, but basically that’s pretty much it.

As a Vaillant ecoTEC owner, one of the main reasons you may have chosen to buy Vaillant, is that they are rated about the best domestic brand of boiler you can possibly purchase, hardly ever suffering any problems or breakdowns throughout the life of the boiler.

In our experience and for whatever reason, lots of people don’t actually ever bother going down the route of system water investigation!
This could be because they just can’t be bothered to do so, or they just might be very busy people, not having any spare time to get a plumber in to quote for a system flush. It also could be that they are planning to move house in the next couple of years, and will just leave it!

 

Intermittent ecoTEC Leaking Diverter Valves explained

Occasionally a customer will say that they have had dripping or leaking water before, from the area underneath where the boiler’s Diverter valve is positioned, but now it all seems to have cleared up and is not leaking anymore.
It would be great if the leak had permanently gone, but alas, unfortunately and in all probability, the problem with the faulty leaking Vaillant ecoTEC Diverter valve has just gone away for the summer!
This is because in summer, when the heating is not being used and the boiler is mainly in hot water mode, this puts the position of the piston rod in the valve, in a new or different position.
In this other position, a different cleaner part of the piston rod (which has no brown staining on it) makes a good clean watertight seal with the O-ring seal. This results in no water being able to leak out, but this of course is only temporary!
When the heating is put back on again in the Autumn, the piston now moves back to it’s more normal position, and unfortunately, the Diverter valve will almost certainly start leaking again, resulting in a new Diverter valve still needing to be replaced to resolve the leaking issue.

The good news is, if you prefer to, you can just change the Diverter valve in the ecoTEC plus or pro boiler, without investigating the dirty system water issues (ideally though you really should think about getting the dirty system water issues checked out). This is because with a brand new Diverter valve fitted, you should get a good few years down the line (time wise) before, any signs of leaking problems, show up on the Diverter valve piston rod again.

So, if your choice is to just replace the leaking Diverter valve, we here at Glowcare can carry out the replacement for you.

We cover most areas in North West England. Glowcare are Vaillant Group’s dedicated service agent for the North West of England, Est. 1992. We carry both the brass and plastic versions of the Diverter valve, both with a 1 year guarantee.

Glowcare can be contacted for a Fixed price Repair to replace your leaking Diverter valve, on 01244 880725 or 07789018775 or Email info@glowcare.co.uk

Thanks for reading!

Glowcare