Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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My boiler keeps firing up even when the Honey well programmer is in the off position. The programmer is about 7 years old.Do I need a new one, a new battery for it or is it to do with the boiler (oil) itself? Gail

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I had the same problem. I traced it to the micro switch in the water/central heating motorised valve having shorted out.

I replaced the (Honeywell) motorised valve and it is now only running when it should.

Jo

Posted on Apr 23, 2009

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