central heating/pump contantly running

[xsmokyx]

I have an intermittant problem where the living room heats up way in eccess of the setting on the room thermostat.

Not sure if its connected but when i turn off everything off at the programmer and the pump next to the hotwater tank keeps running. This happens with both the hot water only on or central heating on.

I have a honeywell 3 way valve next to the hotwater tank, is this the source of my problem?

Should the pump turn straight off when the central heating or hot water is turn off.

Any help would be gratefully received

 

[Newcastle88]

what boiler do you have? could be pump over run stuck on. does the boiler keep firing when the timer is off?

 

[xsmokyx]

Im no expert but i dont think it is a problem with the boiler. The boiler does not fire up when the timer is off. The boiler is a baxi solo pf50.

Should the pump contiue to run after to heating and cenral heat is turned off ?

 

[Newcastle88]

pcb on the boiler is faulty. The pump is wired back to the boiler and the pump over run relay will be stuck on. common fault

 

[Newcastle88]

after the call for heat has stopped the pump over run kicks in to keep the boiler cool. usualy 3/7 mins

 

[xsmokyx]

So are you saying i need the pcb replaced?

Def not the valve next to tank?

 

[Newcastle88]

no the valve sends a switch live to your boiler when a call for heat is made.

The boiler then sends power to the pump. The pcb has has a faulty relay

part number 231711BAX

 

[xsmokyx]

thanks sounds like a job for a sparkie

 

[Newcastle88]

thanks sounds like a job for a sparkie

no you need a gas safe engineer. Sparkys arn't qualified to work on a gas appliance.