Warmflow Condensor Boiler Turning itself on

[barrymurphy]

Hi,

The boiler is coming on when the timer clock is set to off. Because the timer clock is off no motorised valves open and so no heat gets around the house but the radiator nearest the boiler gets hot, (obviously not controlled by the valves).

Why would this happen?

The control box was recently replaced about two months ago but all has been fine since and this has only started happening the past week.

Thanks

Barry

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[barrymurphy]

The two motorised valves had their motors replaced and open and close as they should.

Could this be an aux switch stuck closed?

 

[ianmcd]

The two motorised valves had their motors replaced and open and close as they should.

Could this be an aux switch stuck closed?

Yes most likely culprit, very common fault

 

[barrymurphy]

thanks

 

[barrymurphy]

I assume the only cure is a new valve? aux switch not repairable?

 

[ianmcd]

I assume the only cure is a new valve? aux switch not repairable?

Post pics of what ones you have , some you just change the actuator head, I have succesfully changed just the micro-switch on Honeywell ones , all depends how comfortable you are with soldering electrics, they are a very cheap part and easily available,

 

[barrymurphy]

cheers, will do. done plenty of soldering, thanks