Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Honeywell thermostat Model CT87N4450 heat works but not air 4 wires coming in red, blue, green, white

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  • Frostee45 Jul 26, 2008

    replaced broken thermostat with honeywell CT87N. Labeled and connected wires like they came off. Blue wire I wrapped and tucked. I had an RC and tried RC then R and tried removing the jumper. Still no AC. Am in Arizona and its 111 today. Thank u

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I had the same problem and decided to take a chance and call honeywell customer support. I am shocked, they solved my problem! At least in my situation we found that the blue wire ran the compressor. Instead of hooking up to "blue" on the thermostat, we hooked it up to "white." It works wonderfully now.

Posted on Apr 25, 2009

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Red is power return to turn on heat

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You can get specific guidance on wiring at the Honeywell Website.
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0274.pdf

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