Boiler isnt working on central heating but is on hot water although its not very warm, any ideas what could be the cause
vaillant vcw 242 EH not working on central heating
- Thread starter homerj
- Start date
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It had been working on heating until it was drained, ive checked the high limit stat incase it had cut in
pipework alterations
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It's probably just air locked. Look at the diverter valve on the right hand side, does it pull inwards fully when you put the heating on?
Boiler was drained down throught the PRV, not ideal I know and air vent was opened on refill, the diverter valve pushes out on DHW and goes back in on heating demand, ive also manually pushed it fully in but still wont light
Also if the boiler/system was airlocked it would still run until it started to overheat
Not necessarily, iirc the pump pressure activates the gas valve,
It'll be an air lock in the capilary tubes possibly
Ive opened the vent in the pump, anyone know where I can get a manual for this boiler
when u say the diverter moves in fully does it definately activate both microswitches??they can become lazy and just operate bottom switch.
I manually pushed the top microswitch in just to make sure and it did fire but I let the switch go and it wouldnt relight
Probably air if not blocked pipe on servo usually the back one
It wouldnt relight even when pressing the microswitches back in
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