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I have an Hydra Revolution boiler that used to be driven by
I have an Hydra Revolution boiler that used to be driven by an old mercury-based Honeywell round thermostat ...the thermostat was off many degrees ...so I purchased a round mercury-less Honeywell CXT8… read more
Rick
Rick
HVAC Supervisor
25,145 satisfied customers
I was advised to replace my thermostat. I picked a simple
I was advised to replace my thermostat. I picked a simple round model, but the heat does not come on now … read more
Rick
Rick
HVAC Supervisor
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My questions deals with on/off of a zone valve with a
My questions deals with on/off of a zone valve with a thermostat. When the motor of the zone valve connects to the 24 volt ac it opens and closes. When I place a thermostat CT87K it never opens when t… read more
D.E. Anderson
D.E. Anderson
Industrial Refrigeration Service Manager
200 satisfied customers
I installed a thermostat (ct87k) to my gas fireplace but
I installed a thermostat (ct87k) to my gas fireplace but cannot get the fire to start. It is a two wire set up. If I touch the two wires coming out of the wall together the fireplace starts. Can you h… read more
Rick
Rick
HVAC Supervisor
25,145 satisfied customers
Yes we have a question now. My dad is trying to install a Honeywell
Yes we have a question now. My dad is trying to install a Honeywell thermostat for my sister. The model is CT87K non programmable thermostat. The furnac it is going to is an old Dayton brand sold by G… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
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the laars boiler doesnt work off the thermost but does if
the laars boiler doesnt work off the thermost but does if the wires are jump do you think the wire designations are wrong ?… read more
Rick
Rick
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25,145 satisfied customers
How to hookup a Honeywell CT87K thermostat? I have two wires
How to hookup a Honeywell CT87K thermostat? I have two wires coming out of the fireplace. Have used Honeywell thermostats before. How do you set the switches on the system type? Either the fireplace w… read more
Theplumber717
Theplumber717
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Vocational, Technical or Trade Scho
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Is the honeywell CT87K the correct thermostat to replace a
Is the honeywell CT87K the correct thermostat to replace a 40+ year old mercury thermostat with only two wires? The original 12/2 wiring had a double pole, single throw circuit breaker (both wires HOT… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
13,878 satisfied customers
I purchased a Honeywell CT87K thermostat two hours ago from
I purchased a Honeywell CT87K thermostat two hours ago from Home Depot. I installed it after touching the red and white wires to make sure they were working. The propane gas heater stayed on until I s… read more
Theplumber717
Theplumber717
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Vocational, Technical or Trade Scho
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i am changing a trane thermostat to a honeywell round dial
i am changing a trane thermostat to a honeywell round dial (heat only). there are two wires one is common the other is heat. i blow one already. please help… read more
Bart Jay
Bart Jay
Vocational, Technical or Trade Scho
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
HVAC Supervisor
25,145 satisfied customers
I just installed a Honeywell CT87 round, manual thermostat
I just installed a Honeywell CT87 round, manual thermostat to replace an old digital, programmable thermostat that died. Everything seems to be working now except that the blower fan is ALWAYS on - so… read more
Rick Mather
Rick Mather
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Vocational, Technical or Trade Scho
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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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Hi, I just replaced my mercury thermostat with a honeywell
Hi, I just replaced my mercury thermostat with a honeywell CT87K. I have a 2 wire gravity hot water oil burning boiler with 24 volts across the wires. Very simple system. The boiler will not turn on w… read more
Bart Jay
Bart Jay
Vocational, Technical or Trade Scho
i have a honeywell ct87a with mercury but it went bad so i
i have a honeywell ct87a with mercury but it went bad so i went to home depot and bought a honeywell ct87k i need to know were to put the four wires that i have and also inside the new one it has a bo… read more
Matthew
Matthew
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Bachelor's Degree
2,014 satisfied customers
I am installing a honeywell thermastat CT87N/CT87K round replaceing
I am installing a honeywell thermastat CT87N/CT87K round replaceing an old honeywell mercury 2 wires red/white having problem furnace turns on but will not turn off when temp is turned down?… read more
Johnriba
Johnriba
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Associate Degree
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I have a honeywell CT87K thermostat on a gas fired water heating
I have a honeywell CT87K thermostat on a gas fired water heating system with a circulating pump the room temp displays 72 to turn on the boiler you have to turn the temp to 78 is this nornal… read more
BillyHvac
BillyHvac
Journeyman Service Technician
State Licensed Mechanical Contractor
13,878 satisfied customers
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
Journeyman Service Technician
State Licensed Mechanical Contractor
13,878 satisfied customers
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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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