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I just purchased a new thermostat model RTH111 and am
I just purchased a new thermostat model RTH111 and am replacing an old style Mercury unit with only 3 wires, red, black, and white. Which terminal do I connect with on the new thermostat? … read more
Rick
Rick
HVAC Supervisor
28,172 satisfied customers
I have a National Comfort product heat pump w/backup heat. I
I have a National Comfort product heat pump w/backup heat. I am trying to hook a Honeywell RTH2510 thermostat to it, but the wires from one to the other do not match up. Not sure where to put the wire… read more
gotoman for ac
gotoman for ac
HVAC Service manager and owner
Associate Degree
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Hello. Im installing a RTH2510 thermostat to an L8148AJ AQUASTAT®
Hello. I'm installing a RTH2510 thermostat to an L8148AJ AQUASTAT® RELAY. The previous system had separate wires into the A/C unit and boiler system (which uses the L8148AJ). According to the Aquastat… read more
BillyHvac
BillyHvac
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My current thermostat is an old, mercury, non-programable Tempstar
My current thermostat is an old, mercury, non-programable Tempstar model TAXCOO4T and it has an emergency heat feature. I have a heat pump for A/C and heat. I want to replace it with a Honey well Prog… read more
gotoman for ac
gotoman for ac
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I just bought a honeywell rth2510 programmable thermostat for
I just bought a honeywell rth2510 programmable thermostat for an oil furnace. There are 3 wires, red, white and green, that were attached to the old thermostat. I can't seem to get it wired. No matter… read more
Heath Moyer
Heath Moyer
1,067 satisfied customers
I cant get my heat on. it is only blowning outside temp air.
I cant get my heat on. it is only blowning outside temp air. Please help. all the wires appear to be connected correctly.… read more
airheatman
airheatman
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6 years college
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I have an old White Rodgers S28-16 heat pump thermostat. I
I have an old White Rodgers S28-16 heat pump thermostat. I want to swap it out with a Honeywell RTH2510. The old thermo has yellow, red, blue, white,brown and orange color coded wires. The Honeywell h… read more
M Oglesby
M Oglesby
Vocational, Technical or Trade Scho
2,038 satisfied customers
Our church has a hot water boiler, (2) circulation pumps, and
Our church has a hot water boiler, (2) circulation pumps, and (2) thermostats. We wish to replace current thermostats with (7) day programable ones. What model do you recommend? Downstairs Thermostat … read more
Tim H.
Tim H.
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I have a lennox boiler that is currently connected to an old
I have a lennox boiler that is currently connected to an old mercury thermostat. I want to remove the old thermostat and connect it to a white rodgers programmable thermostat. My current boiler wire h… read more
Rick Mather
Rick Mather
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Vocational, Technical or Trade Scho
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We are trying to install a RTH2510 thermostat - there are only
We are trying to install a RTH2510 thermostat - there are only two wires leading into the old round honeywell thermostat - what do we do?… read more
Richard
Richard
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1,514 satisfied customers
I am replacing a 60 year old thermostat with a 7 day programmable
I am replacing a 60 year old thermostat with a 7 day programmable one. There are only two wires coming out, a red and a white. As you advised a previous emailer, we attached the red to r and the white… read more
Heath Moyer
Heath Moyer
1,067 satisfied customers
I currently have a Honeywell model CT40A4446, thats the number
I currently have a Honeywell model CT40A4446, that's the number on the base plate, and I'm trying to install a RTH2310B programable unit. All I have to connect to the new unit are two wires, one red a… read more
ComfortZone
ComfortZone
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I am replacing an old mercury thermostat with a new Honeywell
I am replacing an old mercury thermostat with a new Honeywell Programmable Model RTH630081005 on a hot water system zone in our garage which uses a fan that has an aquastat controller controlling the … read more
Rick Mather
Rick Mather
HVAC Technician
Vocational, Technical or Trade Scho
3,133 satisfied customers
I purchased a RTH230B thermostat and I read the directions
I purchased a RTH230B thermostat and I read the directions twice before proceeding and again during the instalation. It did not reduce the heat when programmed to do so. I reinstalled it again at leas… read more
Mark Henley
Mark Henley
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3,216 satisfied customers
Hello, I bought a Honeywell programmable thermostat(5-2
Hello, I bought a Honeywell programmable thermostat(5-2 day). There is one thermostat in the house. I have knob tube wiring. I hooked up the white wire with the "w" and the black (hot) wire to the "r"… read more
Mark Henley
Mark Henley
HVAC Controls DDC
3,216 satisfied customers
Im replacing my manual heating/air thermostat with a programmable
I'm replacing my manual heating/air thermostat with a programmable thermoastat. When I went to disconnect the old thermostat I found that it has seven wires connected to it, and the wiring diagrams fo… read more
Jack Pearce
Jack Pearce
Vocational, Technical or Trade Scho
9 satisfied customers
I currently have a Trane digital manual t-stat. I want to put
I currently have a Trane digital manual t-stat. I want to put up a Honeywell programmable th8320u1008.Currently my wiring colors are R-red wire,W-white wire,Y-yellow wire,G-green wire,O-orange wire,B-… read more
ComfortZone
ComfortZone
Associate Degree
515 satisfied customers
I have a Weil McLain, hot water boiler and want to use a programmable
I have a Weil McLain, hot water boiler and want to use a programmable thermostat. Which thermostat would work best with a boiler? I was told a white rodgers, but not sure.… read more
Rick
Rick
HVAC Supervisor
28,172 satisfied customers
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Meet the Experts:

Phil

Phil

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Rick Mather

Rick Mather

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Matthew

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Brian HVAC Guy

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Tom

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A-1 Tech

A-1 Tech

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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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