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

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Cold air will not turn on

I installed the white round honeywell thermostat this last winter, and the heat immediately turned on. Now it's summer, and I tried turning on the cold air for the first time and nothing is happening. Any ideas?? thanks, ultra

Posted by Andrew Vititoe on

  • 2 more comments 
  • Anonymous May 06, 2008

    Im having the same problem I installed a therostat ct87n4450 heat works but no air. I have 4 wires YGWR. Any help?

  • nicknamedog May 19, 2008

    honeywell non programable stat air does not work heat works but not air

    wires coming through the wall are g,r,w,b model # CT87N4450

  • woody11 Jun 23, 2008

    honeywell non programable stat air does not work heat works but not air wires coming through the wall are g,r,w,b model # CT87N4450

  • merie Nov 21, 2008

    Im having the same problem I installed a therostat ct87n4450 heat works but no air. I have 4 wires YGWR. Any help?

    Has anyone answered this. My fan will come on if set at about 80.

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  • 23 Answers

Check your wireing make sure that you dont have the red wire touching the white

Posted on Jan 08, 2010

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WIRING DIAGRAM LOST FOR NON-PROGRAMMABLE CT87

Red is power return to turn on heat

White is common power to both heat and cold

Blue is power return to turn on AC

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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