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I have an MGB boiler system in our house (no AC) that has a
Hey Rick - I have an MGB boiler system in our house (no AC) that has a Honeywell S8600M Intermittent Pilot control unit. We have older programmable thermostats controlling upstairs and downstairs hot … read more
Rick
Rick
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28,878 satisfied customers
Just bought a new honeywell smart wifi thermostat rh9585 - i
just bought a new honeywell smart wifi thermostat rh9585 - i have the wiring as follows from the furnace. Y to y - G to g - R to r - W to w. I have removed the jumper because I have a C and RC wire co… read more
airheatman
airheatman
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I have a in floor heating boiler dual zone (in floor
I have a in floor heating boiler dual zone (in floor downstairs and radiators upstairs), in addition to forced air heating and coolant. Im replacing honeywell wifi thermostats to the old dial mercury … read more
gotoman for ac
gotoman for ac
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I just installed a honeywell wifi thermostat and got the
i just installed a honeywell wifi thermostat and got the cooling system to work but whenever i tried to run the heater the system would start for a few seconds then stop. the system would shut off als… read more
Brian HVAC Guy
Brian HVAC Guy
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Just Answer! what, exactly is the C wire in a HVAC system?
Hi Just Answer! what, exactly is the C wire in a HVAC system? Is it just ground? I'm in Australia and I have a Braemar TG320N gas furnace. It has a Honeywell 32207415-054 thermostat (that is battery p… read more
airheatman
airheatman
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BillyHvac
BillyHvac
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We have model #tam8a0c48v41cba, and we just bought a new
we have model #tam8a0c48v41cba, and we just bought a new wifi therm. By honeywell. it says we need to hook a wire to the com connection on the motherbord.. an you tell me which letter to hook the wire… read more
BillyHvac
BillyHvac
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I have a honeywell focus pro 6000wifi therm and I want to
I have a honeywell focus pro 6000wifi therm and I want to install it into a two wire heat only system. The existing therm connects into a honeywell aquastat controller that doesn't have a c wire at it… read more
Rick
Rick
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I am trying to install a new smart thermostat but can't get
i am trying to install a new smart thermostat but can't get it working. My old thermostat didn't use a "C" wire, the new one does. There is an unused blue wire tucked behind the current install which … read more
joeydelia
joeydelia
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I was trying to install a Honeywell Wifi Thermostat, but there
I was trying to install a Honeywell Wifi Thermostat, but there was no C wire. I looked at the Honeywell Aquastat attached to the gas furnace, and there were two terminals labeled "Thermostat". The 2 w… read more
BillyHvac
BillyHvac
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trying to replace an auomag thermostat that has R W B connections with a honeywell wifi thermostat ; I need a "C" wire and need to which wires to use… read more
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I used an external transformer to power my Honeywell wifi thermostat.
I used an external transformer to power my Honeywell wifi thermostat. The unit powers up but I am missing something with the wiring.I have the white wire to W I have the Green wire to G. I have an ora… read more
Appliance Guru
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Hi, Im trying to install a Honeywell WiFi thermostat RTH6500WF
Hi, I'm trying to install a Honeywell WiFi thermostat RTH6500WF and have no "C" Wire. Can you help? It is connecting to an air handler that is part or an oil fired Hydro-air system. The controller at … read more
airheatman
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I am trying to hook up a venstar t1700 thermostat to my intertherm
I am trying to hook up a venstar t1700 thermostat to my intertherm model MGHA-056ABFC-02. The old thermostat was only a two wire hook-up and I cannot seem to get my venstar to work. It powers up but k… read more
Brian HVAC Guy
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I have an old 2 wire thermostat with only R and W - it works
I have an old 2 wire thermostat with only R and W - it works with a Honeywell digital thermostat. Now I want to upgrade to a honeywell wireless thermostat. Can I simply connect the R and W wires and b… read more
Bill P.
Bill P.
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I want to install the Wifi Thermostat RTH8580WF. I have no
I want to install the Wifi Thermostat RTH8580WF. I have no C wire options - wiring is R and W only and running new cable is not an otion. However, an external transformer is a possibility. Some other … read more
Douglas
Douglas
Vocational, Technical or Trade Scho
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Hi Tech Friends, Replacing old therm with new RTH6350/RTH6450.
Hi Tech Friends, Replacing old therm with new RTH6350/RTH6450. Yes, heatpump. Wires don't match fully. The OLD therm was connected like this: "C" - Blue wire "O/W2*" - Orange wire "Y1/W2**" - Black wi… read more
Matthew
Matthew
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Bachelor's Degree
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installed the RTH2310B to replace a simple mercury thermostat
installed the RTH2310B to replace a simple mercury thermostat (circa 1994). The furnace does not function. The fan does not function on "On." I note that the small screws that hold the colored wires d… read more
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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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