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Why outdoor unit not coming on even after setting temperature too low

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First thing check your ciruit breakers or fuses and make sure you have power to the outside unit. Remove the small cover on the outside unit that covers the contactor, capacitor, circuit board, etc. Then set the thermostat to call for a/c. Check and see if the contactor is pulled in supplying power to the fan and compressor. If it isn't check for 24vac that powers the coil in the contactor. If the contactor is pulled in supplying power then your capacitor could be the problem. You can check it with a multimeter with the capacitor check function. If it looks swollen then it is probably bad. Let me know what you find and I can give you some more stuff to check if that isn't it.

Posted on May 29, 2010

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You have a heat pump.
Once the outdoor temperature falls below 36 degrees, heat pumps will sharply lose their ability to heat.
If you are getting a 72 degree indoor temperature when the outdoor temperature is 28-30 degrees, the heat pump is performing up to spec.
On heat pumps, the air coming out of the nearest air vent to the unit should be heated approximately 40 degrees warmer than the air entering the unit.
If you have a 70 degree indoor air temperature, the heat pump should be supplying 110 degree air at the closest air vent to the indoor unit.
Gas heat is a much better heating source where outside temperatures are commonly below 36 degrees.
Even electric furnaces perform better than heat pumps under these conditions.

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You may have to "reset" it by removing both indoor and outdoor unit batteries, waiting briefly, then reinstalling batteries in the outdoor unit followed by the indoor unit. After awhile, the outdoor unit should begin sending information to the indoor unit.

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just buy another whole weather station (short money) and set both the old and new weather station unit to receive from the single new outdoor sensor.
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After switching the indoor unit to cool, the indoor fan starts and the light flashes, lower the temperature setting to 16 degree centigrade. When the light stops flashing the outdoor fan and the compressor start, if not check the wiring connection going to the compressor contactor. Check if there is power supplying the holding coil of the contactor. If the contactor works, check the power on both contact points by using a volt meter. If the outdoor fan only works, you need to check line working pressure. If the standing pressure is low, compressor will not start.

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1 Answer

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Even though the outdoor fan is running it may not have the compressor on, one quick way to check is to grab the large copper line going to the outdoor unit to see if it is cooler than the small line. Another way is to open access panel and use a amp meter. If the compressor is running it may be low on freon, if not running it could be burned, loose wiring connections, bad capacitor or bad compressor.

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When the first stage heat can't heat the house and the indoor temperature drops 2° or 3° then 2nd. stage heat will kick in and maintain the house temperature at about 2° or 3° below the temperature setting.
If you outdoor unit fails or goes into defrost then emergency heat will kick in and keep the house at 2nd stage temperature approximately 2° or 3° below thermostat setting.
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Sounds like your aircon is stuck on heating mode. Or. The outdoor fan speed is affected by ambient temperature, or low refrigerant. In heating mode the indoor fan will come on for a while to sense temperature and will then wait for the outdoor unit to pump up pressure and build up heat.

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