- Make sure the thermostat is set to "Cool" and not been accidentally moved to "Off" or "Heat".
- Ensure the thermostat temperature is set low enough to make the AC unit turn on.
- Check that the unit's external safety switch (located on an exterior wall near the condensing unit) is set to the "on" position.
- Check that the circuit breaker that controls the compressor and the circuit breaker that controls the blower or air handler is set to the “on” position. Reset the tripped circuit breaker. If the circuit breaker cannot be reset, do not try to reset it more than once. Have a qualified technician check the unit to determine the cause of the problem.
Air Conditioner Won't Turn On? Here's What To Check
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