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Deleted member 64964

Hi Guys/Gals

I am a registered gas engineer and not just a DIYer.

I have been called to a Vaillant TurboMax Plus 828e

Fault is while running in hot water mode or heating but more so in full rate/DHW, it fires up and runs but the flame drops as if its running out of gas a bit and starts to spark again as it loses proving eventually in secs not mins it shows an F29 and locks out.

In order to stop it doing this I lowered the burner pressure to 6mb ish and it wont do it, if you take it above this to the 10.8mb it should be it faults the higher you try to take it the worse it gets and the less time it will run.

I have changed the PCB as Vaillant Tech said it would be that.
I have put a new Gas Valve on it.
I have had the regulator changed on the meter.
It has had a new electrode on it but not by me, its proving anyways otherwise it would fault all the time surely and not just when BP is low

So please anyone could you advise what the hell is going on with it lol

Thanks in advance.
 

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