Problem: whole system stays on until I turn down room thermostat until it clicks (i.e. it isn't up to temp yet). This switches the boiler off, but the system still stays on pumping for about 15 minutes until the boiler (?) has cooled down. Changed the programmer/timer and the overheat thermostat in the boiler, and the room thermostat to no effect.
Currently have thenew timer set so the water goes off (and therefore so does the boiler) 30 minutes before the CH and then it shuts down fine. If I use the room thermostat to try and shut the system down it doesn't do it.
Faulty electronic thermostat circuit board maybe, or faulty overheat cutoff?
Boiler's a Vaillant ThermoCompact VC GB 142 EH.
Thanks in advance for anyone's help.
AJ
Currently have thenew timer set so the water goes off (and therefore so does the boiler) 30 minutes before the CH and then it shuts down fine. If I use the room thermostat to try and shut the system down it doesn't do it.
Faulty electronic thermostat circuit board maybe, or faulty overheat cutoff?
Boiler's a Vaillant ThermoCompact VC GB 142 EH.
Thanks in advance for anyone's help.
AJ