If i blow into the APS (via restrictor) the boiler lights up, heats and runs for about 5 minutes but will not start again even when the room thermostat or hot water thermostat is calling for heat. I know the central heating pump is working and the boilers fan seems to be going strong.
I suspect the mid position valve (MPV) is faulty as recently i found that the radiators only get hot if i am calling for hot water and the MPV is set on manual.
I would like to get the system working prior to signing up for a British Gas care plan.
Hi Matt, The fan only starts when i blow into APS now. The system was making HW via timer ok but no CH unless as i said the MPV was in manual position - as soon as HW tank was full, call for CH was no longer firing boiler. I have used Glow Worms troubleshooting guide in the manual and that says the cable harness or connections to fan are faulty but i know thats not right because if i blow into APS 240v appears on the fan wiring - but not before i blow into APS. Can the MPV hold the system off if its faulty?
Thanks in advance
Steve
Steve Brown
November 2008
why are u blowing into the aps if the mid pos valve is faulty ?? if the fan is running the boiler is being told to fire
matt
November 2008
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.