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The heat pump wont turn on - Heating & Cooling

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the heat pump wont turn on - 6f159214-5171-4c22-9fa7-538aa50dd85d.png
First step is go to your thermostat and turn the Fan switch from AUTO to the ON position, if the indoor blower runs you have proven that you have both high and low voltages and no need to check breakers, and fuses both high and low voltage.

If the Fan does not come on then you need to determine whether you have high and low voltage, the high voltage may have a time delay fuse as well as a beaker, these fuses are located at the electrical disconnect typically within 3 feet of the unit, inside it in a plug/fuse holder that must be replaced in the correct position as 180 degrees off = OFF or no power.
If you do have high voltage the next thing to check is the 24 volt control voltage from the transformer in the heater.
There will typically be a 3 to 5 amp automotive type fuse located on the circuit board located in the heater, this is often the reason for no 24 v control voltage.
These 2 diagrams demonstrate a heat pumps wiring. if split type system.

Posted on Oct 10, 2013

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