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My heat pump is pumping out warm are instead of cool. I have our thermostat set to 69, on cool, and it got up to 80 degrees before I finally turned if off and opened the windows. This is my first time using the Heat Pump this spring for cooling. Not sure why I'm not cooling down.

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Its wired wrong the thermostst has wires running to the indor unit and the indor to the outdor wiring these units can be a bit complicated even for pros so use your judgement if you dont think you can handle it leave it to a pro be couse you can cause serious damage to your electronic board and that will surely cost you

Posted on May 27, 2008

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If it's "dual fuel" like heat pump with gas heat, the heat on the heat-pump side won't "feel" warm in the extreme temperatures we've seen in much of the country lately.....2nd stage gas will feel MUCH warmer. If purely electric, 1st stage heat may be off due to a manually resettable high limit switch/ bad heat contactor (giant relay), or a misapplied or defective thermostat. NOTE: if somebody recently painted OR wallpapered, AND it's a mercury-bulb T-stat, It HAS to be level and the connections must be tight!

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See if it happens only when your temperature of the room is more than 3 degrees of your setpoint temperature. Since you have a heat pump, the auxiliary (electric heat strips) is use for backup of the heat pump when it can't keep up. The heat pump will run by itself if it can maintain temperature within a couple degrees. If it is too cold outside to handle the load or you set the temperature more than 2 degrees past room temperature, the auxiliary will turn on. The thermostat has a memory of how long it takes to reach desired temperature. If it goes into auxiliary mode trying to satisfy setpoint during the last call for heat, it will start the next call for heat in both aux & heat pump mode until the thermostats algorithm (timed program) allows only the heat pump to run. Not sure if you have an air to air, or geothermal heat pump. The outside air temperature will affect only the air to air system ie. when the temps drop outside, the heat coming out of your vents will be cooler...the air to air systems drops efficiency when the outdoor air drops.

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If your thermostat has an emergency heat setting this means you have a heat pump system.
Yes you need to set the thermostat to heat for heating the house.
The emergency heat setting should never be used unless your outside unit is not functioning.
The emergency heat setting overides the heat pump (the outside unit will not be energized).
The emergency heat setting will run the auxillary heat (heat strips) only.
When the thermostat is set in the heat position the heat pump will run to heat your house.
If the heat pump can't keep up (extreme cold) then then the auxillary heat will kick in to augment the heat pump until it satisfies the thermostat settings. If your room temperature gets 2 degrees below your thermostat setpoint, your auxillary heat will kick on. Example, say you are going to be gone a couple of days and you turn your heat down to 60 degrees. When you return and it is 60 degrees in your house, you turn the thermostat up to 70 degrees. Since you are turning the temperature up 2 degrees or more (10 degrees in this case) from the 60 degree room temperature then the heat pump will come on and the auxillary heat strips. The unit will continue heating like this until the temperature in the house gets to 69 degrees and the heat strips will turn off and the heat pump will continue to run until the 70 degree setpoint is reached.
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1 Answer

I just put in this new thermostat, I believe all the wiring to be correct i have one extra wire (brown) that should be a common wire used to keep the display lit. when I turn the unit on cool ( with the...


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Hello, When I set my AC unit to "Heat" and turn it on, the air will come out warm, then after a few hours the air starts to come out cool. To make it warm again I need to set the...


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1 Answer

My Trane thermostat (TCONT600AF11MAA) is supposed to have 1.5 degrees of heat pump "rest" above the desired setting before turning on the heat pump. The thermometer reading does not change yet...


Friend! All thermostat is calibrated to cut in and cut off at the end of - or + 1 degree end.
Example: If you set 23 degree, it will cut off in 21 degree and cut in @25 degree. So accordingly you set the temp.
Secondly, don't set temp near to your room temp.Minimum difference should be 3 degree. If your room temp 12 degree, set at least 15 degree for heat and if room temp 28, set at least 25 degree for cool.
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1 Answer

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1 Answer

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If this is not the case, if its not a problem of where the heat is coming on with the air conditioner, it could be a case of the reversing valve malfunctioning. The way a heat pump works is it reverses the flow of the refridgerant. For instance, many heat pumps the reversing valve is activated in cool. That would mean that there is a low voltage circuit that activates the reversing valve when the heat pump is in cool. I'm not sure what model/brand your heat pump is, Goodman and Janitrol for instance, the heat pump reversing valve is activated in cool. In any case, if the reversing valve is not operating properly, when the air conditioning is set to cool it will actually be heating. Or you could set it to heat and it may actually be cooling instead of heating. Please check these two items first and if you have any further questions, please let me know. Especially if you know of any additional problems like the evaporater is icing up or if the air handler fan is not operating when it should.

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1 Answer

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