Boiler control

Mafopp5 · Posted: Sat Nov 24, 2007 9:26 pm Post Subject: Boiler control

After years of no problems, my boiler now operates only on its internal thermostat, even when the timer is off. I thought it might be the frost stat, but this checks out okay. To shut it down at night I have to turn it off at the mains. The fan seems to be permanently on. It is a Potterton Neataheat. I am about to change the RWB9 programmer, but any other ideas out there?

gas4you · Posted: Sat Nov 24, 2007 9:34 pm Post Subject:

Check the live supply from the programmer. If it never goes off then it will confirm the programmer at fault.

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Dave
DRL Gas Services

bengasman · Posted: Sun Nov 25, 2007 11:11 am Post Subject:

fan permanently on? could be low speed to facilitate pilot. could be faulty diverter

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chrishutt · Posted: Sun Nov 25, 2007 11:40 am Post Subject:

Motorised valve micro switch stuck on?

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Mafopp5 · Posted: Sun Nov 25, 2007 2:10 pm Post Subject: Boiler Control

Thanks for all the responses. I think it may be the programmer and will change that next week. I'll also check the motorised valves in case their microswitches have stuck. great help thanks.