Question about Honeywell Programmable Thermostat Heater

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Honeywell programmable Thermostat won't hold time or program

I woke up to find the furnace not running as it was programmed to do. The furnace was not running. We replaced the furnace circuit breaker. But the Thermostat keeps reverting to 1:00 p.m, or sometimes goes blank. When we reset day, time and temperature it runs for a while then reverts back to 1PM. The furnace works but not according the time and program we set and want.


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  • 137 Answers

Most thermostats use a six volt transformer for a power source, similar to a door bell, you can tell if yours does by looking at the wires that are attached to the thermostat.

The wires will be thin with just a single strand if you have these wires then you have a transformer, try and find the transformer (good luck) test it with a voltmeter if it fails the test that's it, if not, call the man. Probably it though.

Posted on Feb 15, 2009

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Posted on Jan 02, 2017

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Re Co stands for Recovery Mode. That means if you have programed your thermostat to be at say 72° at 5:00 then it should kick on in Recovery Mode several minutes before 5 in order to reach that temperature. This is normal and doesn't indicate that something is wrong, just that your thermostat is trying to reach or recover the programed temperature.

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