Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
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.
Posted on Apr 23, 2009
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Posted on Jan 02, 2017
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