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My air conditioner doesn't turn off when the thermostat reaches the preset temperature

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Chech for a short in your tstat wire

Posted on Sep 08, 2010

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Series 48000 with heat pump we don't want this to run all the time will the heat shut off when it reaches a certain temp also if the power goes out does it come back on automatic we want to heat our place...


Not sure about your particular make and model, but air conditioners are designed to work with a thermostat to control the functions. A properly functioning thermostat will stop the compressor when the set space temperature is satisfied. When the space temperature falls below (heating) the set temperature, the thermostat should turn it back on. In the event of power failure, an electronic thermostat probably will not operate at the previous set temperature when power is restored, but maybe at a higher temperature (but will work).

Dec 05, 2013 | Coleman Mach 15 Air Conditioner

1 Answer

Cool will not come on when it's set in auto mode


A thermostat is only a switch, nothing more. It's job is to cut on and off the cooling/heating equipment based on a preset temperature setting. It sends 24-28 volts to a contactor or relay which does the actual closing (turn on) or opening (turn off) the power to the compressor or furnace, and that's all it does. There could be a problem with the other parts of the system. When the space temperature exceeds the preset temperature the thermostat should provide 24-28 volts to the compressor contactor, to start the compressor. The "Auto-on" switch on the thermostat controls the fan only. If there isn't 24-28 volts from the thermostat to the coil of the contactor, the compressor will not operate,

Oct 30, 2013 | Hunter Fan Company 42999B - Heat/Cool...

1 Answer

I have the carrier infiniti system. When my thermostat reaches the set temperature it doesn't always shut off. I shut off the main control to let it reset. It works for a while and then it starts


Carrier Infinity system is a variable speed unit that will just slow down as it approaches set point. Unless it overshoots the set temperature (you have it set on 72 and the temperature keeps rising above 72) this just sounds like normal operation.

Nov 13, 2012 | Heating & Cooling

1 Answer

Duo-Therm ac when the temerture is reached the fan will shut off but the compressor stays running


Sounds like you hit it on the head--compressor should turn off when unit reaches the preset temperature.

Jun 10, 2012 | Dometic Rooftop RV Air Conditioner

2 Answers

The air conditioner cools the room but it shuts of. The power light doesn't come on while unit is on. Can I replace the plug?


"The air conditioner cools the room but it shuts of." -- Temperature reached, but does not turn back on automatically? Stops short of reaching temperature? Shuts off for a period, but will come back on only to shut off again later?
Most importantly, how do you get it to turn on again?
"The power light doesn't come on while unit is on." -- If the unit is on and the power light is not, then the power light must not be operating (is burnt out).
Actual answer: "Can I replace the plug?" -- Of course you can.
What is causing you to feel that the plug needs replaced?
:o).

Jun 04, 2011 | Daewoo DWC-056CL Air Conditioner

3 Answers

I have an APE08AJM1 GE Portable A/C that the compressor doesn't cycle off and on when it reaches the preset temperature on the panel.


Either the temp sensor is dirty or bad, or the thermostat is malfunctioning.


Clean the sensor first.

If it does not fix the problem.......

While turning the t-stat all the way up and all the way down, listen for a click. If there is no click, replace the t-stat. If there is a click and the compressor still does not shut off, the relay is stuck and should be replaced.

Jan 31, 2010 | GE APN10AA Portable Air Conditioner

1 Answer

AC comes on and stays on until you move the setting up to around 90. At times the unit will not cut off no matter what setting you choose. If it cuts off at 90 after manually moving it there, you only have...


If the house is actually cooling, but the thermostat thinks in 90 degrees in there, you definitely need a new thermostat. If the house is actually 90 degrees, the AC SHOULD cycle on and stay on till it reaches the preset temperature. Since it doesn't make sense that you would complain about the AC cycling on at 90 degrees, I can only conclude that you have a faulty thermostat.

Jun 11, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Adjusting thermostat temperature


nope. Try bouncing the air off the ceiling instead of pointing it towards the floor. You know the vent grille should be adjustable. The air is just recirculating back into unit and short cycling stat. Create a barrier between supply and return!

May 27, 2009 | Heating & Cooling

2 Answers

Air conditioner won't shut off when temperature reached


suspect a stuck contactor on condenser unit or cooling relay stuck

Jun 14, 2008 | Kenmore 72055 Air Conditioner

1 Answer

Magic Chef Oven lights and shuts off


This could be caused by a lack of air within the oven cavity, once the air is used up the flame will go out, it will then work again once it is relite, but will probably do the same again, this could be dangerous and requires on site proffesional attention. Regards Engineer

Jun 10, 2007 | Magic Chef CGR1415AD Gas Kitchen Range

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