York HP Series Service Manual page 98

16.4.3 Fan speed malfunction diagnosis and solution (E3/F5)
Error Code
Malfunction conditions
Potential Causes
Trouble shooting:
E3/F5
When indoor fan speed is too low (300RPM) for a certain period
of time, the unit ceases operation and the LED displays a failure
code.
Wiring mistake
●
Faulty fan assembly
●
Faulty fan motor
●
Faulty PCB
●
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