MUND CLIMA MUPR-H6, Service Manual, Page: 46 / 58

46
10.2.3 Fan speed has been out of control diagnosis and solution (E3)
Error Code
E3/F5
Malfunction decision
conditions
When indoor fan speed keeps too low (300RPM) for certain time,
the unit will stop and the LED will display the failure.
Supposed causes
●
Wiring mistake
●
Fan ass’y faulty
●
Fan motor faulty
●
PCB faulty
Trouble shooting:
Power off, then restart the
unit 2 minutes later
Shut off the power supply,
Rotate the fan by hand.
The unit operates normally.
Find out the cause and have
it solved
Check the wiring of fan
motor
No
Yes
No
Correct the connections.
No
No Replace the fan motor
Yes
Yes
Measure the voltage for the
fan motor from the main
PCB
Yes
Replace the main PCB No