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

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WIRING DIAGRAM LOST FOR NON-PROGRAMMABLE CT87

My husband installed this thermostat last year before we had our gas furnace put in (used to be an oil furnace). We are trying to test it, but it seems not to be working correctly. I'm trying to trouble shoot the wiring to see it if is set up correct, but don't know where each wire should go. I see a red, white, and blue wire coming in. Inside the case of my thermostat it has the numbers: 0612 CT87N4450

It seems to be working on some positions (tested with a continuity checker), but not as expected.

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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

Posted on Aug 30, 2010

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Is there a switch or setting to change the t-stat to gas or oil?

Posted on Oct 05, 2009

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SOURCE: Honeywell RTH 230B Thermostat Wiring

put the jumper back in RC and RH and that should do it.

Posted on Apr 15, 2009

  • 1 Answer

SOURCE: honeywell thermostat

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

billyvangogh
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SOURCE: Installing thermostat - extra wire?

you have to go down to your furnace and follow the thermostat wire ...it connects to a terminal strip or fan centre...the color doesn;t really matter...installers mix and match all the time....look at the furnace wiring and mark it down...Red on "R"...Green on "Y" whatever it is...and connect it accordingly upstairs...if you only have 4 thermostat wires downstairs you will need a jumper wire between RH and RC...if you have 5 wires you will see 2 wires on "R" at the furnace.,...and connect either to RH and RC at the thermostat
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Posted on Nov 01, 2009

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