Beast from the east!! :@ Viessmann F4 fault

[Tommo25]

Viessmann Vitodens 100, won’t ignite,
Checked flue - clear
Condense - ok
Power at gas valve
Fan starts
Electrode sparks

Still not igniting gas in the burner?
Can anyone advise ?

Was thinking maybe condense froze and water backed up and broke electrode but it sparked across fine.

Going back in the morning for further investigation maybe you guys have some ideas?

Thanks

 

[Nico]

Is the gas valve letting Gas pass? Could be the solenoid on the gas valve

 

[ShaunCorbs]

any other gas appliances ?

reg prob frozen

 

[Tommo25]

Also gas fire and hob

 

[Nico]

If there is no gas to all 3 appliances then I would agree with Shaun above

 

[ShaunCorbs]

Also gas fire and hob

working?

 

[Tommo25]

Will try again today going back soon thanks

 

[fixitflav]

Is the gas valve letting Gas pass? Could be the solenoid on the gas valve

I'll second that. I had that problem on mine earlier this year. Two solenoids, one was open circuit. Got one from Solenoids UK, less than £12, for a temporary fix to confirm fault and while waiting for the right one from Italy.

 

[Nico]

Will try again today going back soon thanks

Hopefully you have a bit of luck today then

 

[townfanjon]

@Shaun, public forum!!!

 

[Tommo25]

Sorry didn’t realise I’d put it public , boiler ok now, changed electrode block and gasket and it lit first time. Not completely sure why as the old electrode seamed to be sparking ok.

Last couple of days had about 8 viessmann all with f4. Most was frozen condense. Got another one with maybe an electrode fault.

 

[Tommo25]

Does anyone have an idea as to why the new electrode solved the problem, even though the old electrode was sparking fine?

Thanks

 

[ShaunCorbs]

Could of gotten damp etc