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Honeywell ct3500a4453 My display isn't working and the batteries are new. Heat still kicks in.

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Posted on Jan 02, 2017

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SOURCE: Trying to replace honeywell T8001C thermostat with

Red is usually hot side of transformer,yellow is for the a/c compressor,white is for heater,green is for the blower fan,now the blue could be energize for heat or the common side for the transformer,brown can also be the common side of the transformer. It sounds like you need the blue wire connected to the common side for the thermostat....but be careful. Some units use this as a energize wire and are not a common. I would find out what furnace model you have then look online and double check what this wire is or you could damage the new thermostat and/or the 24 volt system on your fau. And also always have the power to the unit disconnected so you do not ground a circuit.

Posted on Oct 03, 2009

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SOURCE: My honeywell theromstat keeps displaying repl bat

Have you checked to make sure the batteries are, in fact, good and that they are facing the right way? If so, it's time for a new thermostat.

Posted on Oct 04, 2009

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1 Answer

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