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Please recheck the error code. Are you sure the code is P4 and not F4? Carrier does not list a P4 but it does list an F4 error code. F4 means outdoor mid-coil temperature sensor malfunction. Or how about E4? E4 means compressor discharge high temperature protection.
Unplug or turn of breaker to unit. After unplugging press and hold (about 3 seconds each) power button about 5 times, wait for about 10 mins, repower then try. If nothing, with power on press and hold power button for 10 seconds
Unplug or turn of breaker to unit. After unplugging press and hold (about 3 seconds each) power button about 5 times, wait for about 10 mins, repower then try
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