F28 - Vaillant Ecotec Plus 831

[Merlin5]

Hi guys. Last night I got alternating codes 'F.54 Fault Appliance Start' and 'F.28 Failure in startup Ignition Unsuccessful'. I pressed the black ignite button and the screen lit up saying 'loading..' Then I heard some whirring noises as it presumably tried a few times to ignite because a burner icon flashed on and off a few times. And then it displayed the fault codes again. I tried this a couple of times with no success. I left it for half an hour and came back to try again. This time I turned the main white power button off and then on again, and then I pressed the ignite button. This time it worked and now I have hot water again. I guess I must have reset it. I'm concerned it might happen again. Probably related, but about a couple of weeks ago whilst taking a shower the water went cold. I turned the shower off and then on again and the water got hot again. I've had two incidents of that. Does that and the F.28 sound like a gas valve or sparking electrode issue in the boiler causing intermittent problems?

 

[ScottishGasMan]

It sounds like a lack of gas reaching the burner, but you would need a registered gas installer to inspect it to find out, its not a diy issue to fix.

Id be a little suspect that the shower went down during use though, that would likley be unrelated to F28/54 as it wouldnt come back on without resetting the boiler so there may be more than one issue in the system. But it if continues to happen then it will need looked at by a pro.

 

[Deleted member 267285]

Yep, sounds like a lack of gas, only thing you could check from a consumers perspective, is to check to make sure that the emergency control valve at the gas meter is fully upright. If this is ok, then as per @ScottishGasMan you need it looking at by a professional, it could be a number of things.

 

[DP]

Chris and SGM, thank you for putting up a helpful reply