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There should be a fan symbol on your remote control. In the "mode" control, there should be the following options.. Heat, cool, Auto and fan. If you select fan, only the fan will run. No heating or cooling.
It depends on the type of heat. If your air conditioner is a heat pump where it runs in reverse (takes heat from the outside air and pumps it into the house), the condenser fan will run. If heat is auxiliary electric coils, only the inside fan should run.
The indoor fan will continue to run. When heat pump goes into defrost the outdoor fan stops, the reversing valve switches and the unit is basically working in the cooling mode. In order for you not to feel a blast of cold air in the winter the electric strip heat also comes on so the indoor fan must run while the strip heaters are on.
The outside fan should be running except when the Heatpump goes in to defrost mode. Then the fan stops with the compressor running and it switches the reversing valve to heat up the outdoor coil. That should last about 5 min and you may see steam come off of the outdoor coil. That's normal. Is the compressor running? It's possible that it's stuck in defrost or the fan simply died. I hope this helps.
then you need toi have them check the fan high limit that is mounted in the blower compartment. if it's closed then the blower fan and the conmbustion air fan will run together.
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