Question about Heating & Cooling
The rh and w wires should not be on the same screw. That would make the heat run all the time because it would bypass the thermostat. It sounds like you had power on the rh wire which is the hot wire from the transformer. If you connected it to w and the heat still didn't come on then your problem isn't the thermostat. You should check the contactor or relay that makes the heat kick on. I don't know what type of system your thermostat is controlling so I can only give you limited advice on that.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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