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Carrier heat pump

I replaced the thermostat controling our 20 yr old carrier heat pump and the furnace will not power up now. The wiring to the thermostat is wired as the furnace is letter for letter. Is there a fuse or something I may have blown out? I did not turn off the breaker the first time I hooked up the thermostat?

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Fuse is usually a small resetable breaker on the side of the transformer, or a traditional screwin fuse with a plastic cap on one end that is a specialty fuse and is available at most motor shops or elec supply houses. or its a auto type plug in fuse on the circuit board usually 5 amps or three amps. first turn the fan switch on the stat from auto to on. does fan run? if it does you have high and low voltage and your wired wrong. if it is in the stat you are usually looking at red connects to red . yellow to yellow, green to green , orange to orange, white usually to white, that leaves a common power wire to operate the stat, usually connected to the common term on the new stat . this can be any color and is necessary for the new stat to think and work, if it has batteries it will have a display but it needs a red and a common to think and work. this wire can be any color and if your old stat had no common which a lot didnt then youll have to add one. carrier also has a emergency heat strip wire sometimes labeled x2 etc. you can usually jump white over to x2 to perform function if needed. good luck.

Posted on Oct 25, 2008

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2nd part, you may need to replace the themostat wire if the wires are shorting out. In particular the white wire is the normal color for thermostat for w connection for furnace control. If a white wire is shorting to any control wire that has 24 volts on it, like the green wire for the fan, red wire for the control voltage to most controls etc, the furnace will run continuously as long as the furnace is getting the voltage on the white wire. To check this out, turn the thermostat to off and check the voltage on the white wire to common. If 26 volts is present, the wire is shorting somewhere and the thermostat wire that is damaged needs to be replaced. I have seen pets, rodents, lawn mower blade damage, bad insulation problems and overdrawing components causing theromostat wire deterioration.
3rd possibility, is remote due to the unit has been installed for 10 years, but if recent addtions were made to home, the unit may not produce enough heat to heat the additional demands of added rooms. In particular, this winter has been really cold in some locals and the unit may just be undersized.
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Please note. Not all installers use the proper color codes when they install or replace equipment. It may be necessary go go to the furnace or outdoor unit to verify what wires are for what purpose. Also be sure there are no splices in the wire that could change the wire colors between components.
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Note: If only furnace has a transformer and cooling equipment does not jumper Rc and Rh.
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Note: W2 is most often used for heat pumps to control what is called emegency heat or Auxillary heat, and most often will use the white wire.
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  • C (common) most often brown but can also be black or other color available to installer.
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