Fisher FSAI-SU-92AE2 Service Manual page 40

8.2.3 Fan speed has been out of control diagnosis and solution(E3)
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Power off, then restart the
unit 2 minutes later
Yes
Shut off the power supply,
Rotate the fan by hand.
Yes
Check the wiring of fan
motor
Yes
Measure the voltage for the
fan motor from the main
PCB
Yes
Replace the fan motor
E3/F5
When indoor fan speed keeps too low (300RPM) for certain time,
the unit will stop and the LED will display the failure.
Wiring mistake
●
Fan ass'y faulty
●
Fan motor faulty
●
PCB faulty
●
No
No
No
No
The unit operates normally.
Find out the cause and have
it solved
Correct the connections.
Replace the main PCB
No
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