Ecotec plus 831, F53 fault code

Jimmyjaffa · 29 Dec 2021

Hi all, my 831 has been a little temperamental the last couple of days after a pcb board change. I've read the fault codes and cleared them and the same code comes back, F53. Am I right in thinking this to do with the gas valve? Are these valves repairable by a gas fitter or is it just a swap out?

Many thanks
Jim.

Deleted member 267285 · 30 Dec 2021

Any gas related work should be carried out by a competent person, ideally someone who is gas safe registered, but you must be able to perform a flue gas analysis afterwards.

muggles · 30 Dec 2021

You won't get help with that here I'm afraid, as forum rules prohibit giving DIYers gas advice. DIYers shouldn't even be removing the front cover on this boiler - it forms the safety room seal and should only be removed and refitted by a Gas Safe Registered Engineer with the correct tools, knowledge, and qualifications to carry out the Regulation 26.9 checks on completion.

Solution - call a Gas Safe Registered engineer familiar with this boiler

Giovanni88 · 19 Feb 2024

Hi @Jimmyjaffa ,
Have you solved your problem? I'm very interested in your feedback.
I'm also having trouble with the F.53 error code.
I had a Vaillant technician come and replace the venturi.
A week later, the F.53 error code appeared again.
I'm also thinking of a problem with the gas valve.
Before replacing it, I'd like to know your opinion.

Thanks in advance

TheTank · 2026-02-09T22:02:53+0000

Giovanni88 said:
Hi @Jimmyjaffa ,
Have you solved your problem? I'm very interested in your feedback.
I'm also having trouble with the F.53 error code.
I had a Vaillant technician come and replace the venturi.
A week later, the F.53 error code appeared again.
I'm also thinking of a problem with the gas valve.
Before replacing it, I'd like to know your opinion.

Thanks in advance

Hi @Giovanni88,

Have you solved the issue that you were having?
I also had an F.53 fault code. The Venturi was replaced, but the error returned.
Do you have any suggestions on what the problem may be?

Thanks

CountryFan · 2026-02-10T00:01:24+0000

In the 2 years from Giovanni you’d hope so. As per deleted member and @muggles you’re asking for gas related advice.

Jimmyjaffa · 2026-02-10T00:05:13+0000

Hi, tbh it’s still on going. Mine is very intermittent so I’ve left it. Mine tends to shut down when heating is on quite high and someone’s having a shower. Quick press of the reset and all back to normal. My gas man said it’s more than likely the gas valve at fault.

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Ecotec plus 831, F53 fault code

Jimmyjaffa

Deleted member 267285

muggles

Giovanni88

TheTank

CountryFan

Jimmyjaffa

DIYnot Local

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