Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater
I am trying to install a Lux mechanical heating and cooling thermostat that has G, Y, W, and Red wires.
When I have the switches on Cool and Auto, and move the temp control to a low setting, it comes on just fine.
But when I have the switches on Heat and Auto, nothing happens.
Common color code is as follows:
Terminal Wire Color
Y Yellow or Blue
This does not guarantee your thermostat was wired to common color code. Assuming it is a single transformer forced air heating and cooling system the following is likely your problem there should be a RC & a RH termial on your new thermostat incase you need a split sub-base for multiple transformers. My guess is that you are connected to RC, if there is not a wire to RH the heat function will not work. the thermostat should have been supplied with a jumper to connect RC & RH together for single transformer applications. If not any small gage piece of wire will work, if I have assumed incorrectly please give me more info about your system.
Posted on Dec 18, 2008
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Posted on Jan 02, 2017
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