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I purchased a replacement Honeywell thermostat CT87K Round
I purchased a replacement Honeywell thermostat CT87K Round unit that has three wiring termals marked R, W, Y. Mu existing wires are green, yellow and white. The yellow and white were on the same screw… read more
Rick
Rick
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My Ct87k will not shut down, heat continues to run. Gas
My Ct87k will not shut down, heat continues to run. Gas steam boiler. Can you please help … read more
Phil
Phil
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Degree, Mech Engr Technology
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The red light is blinking, with no discernible pattern, just
Hi. The red light is blinking, with no discernible pattern, just on off. But neither the hear nor the AC will activate.… read more
airheatman
airheatman
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I have a Carrier Weather Maker 1200 propane furnace. Heat
I have a Carrier Weather Maker 1200 propane furnace. Heat only. Old thermostat gone. Four wires sticking out of wall: Red, yellow, green, black. Bought Honeywell CT87K thermostat to replace missing th… read more
airheatman
airheatman
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We have model #tam8a0c48v41cba, and we just bought a new
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BillyHvac
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I have 3 wires coming out where the thermostat goes, red,
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airheatman
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the laars boiler doesnt work off the thermost but does if
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Rick
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How to hookup a Honeywell CT87K thermostat? I have two wires
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Theplumber717
Theplumber717
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Hi, I am replacing my old 5 wire Honeywell thermostat. The
Hi, I am replacing my old 5 wire Honeywell thermostat. The new Honeywell t-stat (model CT31A) is built for only 4 wires - can I somehow convert to still use it? The old one had terminal markings of Y,… read more
gotoman for ac
gotoman for ac
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my old thermostat has two black wires going to it. My new Honeywell
my old thermostat has two black wires going to it. My new Honeywell RTH2310B has spaces for about 5. I don't have central air, just a gas furnace. Can you tell me which two terminals to attach the wir… read more
Tom
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I just installed CT87k. I had two wires, one was black and
I just installed CT87k. I had two wires, one was black and the other white. I put the black wire in the "R" position on the wire block and the white wire on the "W" position. Does this sound correct t… read more
Rick
Rick
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Hi. I have an old honeywell mercury thermostat # t87f 2873
Hi. I have an old honeywell mercury thermostat # XXXXX 2873 3 9147 it was hooked up using 2 wires. white and black. I am replacing it with a honeywellct87n/ct87k The indications are R W Y... There are… read more
gotoman for ac
gotoman for ac
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HELP....Please....I removed my old thermostat and labled the
HELP....Please....I removed my old thermostat and labled the wires like the instructions said to do...however when I was removing the back plate the lables came off...and I can't remember which wires … read more
gotoman for ac
gotoman for ac
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THEFIXER1966
THEFIXER1966
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I bought a new honeywell themostat CT87N.the old one and its
I bought a new honeywell themostat CT87N.the old one and its wiring were already gone.The old wiring at the furnace is using three wires red green and white.To what terminals do I wire the new one to?… read more
Douglas
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I bought a power robbing thermostat. The thermostat i had was
I bought a power robbing thermostat. The thermostat i had was non power robbing. I was only using three wires R, W, G. The new thermostat needs for wires R, W, G, and C or common. I connect the themor… read more
Mike
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Just installed a new Honeywell CT87K thermostat. Didn't work. The furnace functions normally if I short the two leads (coming from the wall) together. My furnace is an old Waterman Waterbury that stil… read more
Bill
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we just purchased and installed the honeywell ct87k thermostat,
we just purchased and installed the honeywell ct87k thermostat, just heat, we have forced hotwater oil heat, what would the switch be set to? (on, off) we put the red wire in the r and the white wire … read more
BillyHvac
BillyHvac
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Meet the Experts:

Phil

Phil

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Rick Ridley

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Tom

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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