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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
E8/ EC 07 (Outdoor fan speed malfunction)/ EC 71(Over current failure of outdoor DC fan motor) diagnosis and
solution
ERROR CODE
MALFUNCTION DECISION
CONDITIONS
SUPPOSED CAUSES
Troubleshooting
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
E8/ EC 07/ EC 71
When outdoor fan speed remains too low (300RPM) or too high (2400RPM) for a certain time, the unit will stop
and the LED displays the failure.
Wiring mistake
Faulty fan assembly
Faulty fan motor
Faulty PCB
Power off, then restart the
,
unit 3 minutes later. Is it still
s
.
displaying the error code?
?
Yes
Shut off the power supply,
rotate the fan by hand.
.
Does it rotate properly?
Yes
Check the wiring of fan
motor. Are all the
.
connections good?
?
Yes
Check whether the main PCB
is normal through index 1?
1?
Yes
Replace the fan motor
No
The unit operates normally.
Find the cause and fix it.
,
For example, whether
No
the fan is blocked or
the screws which secure
No
Correct the connections.
No
Replace the main PCB
No
58
.
,
or
the fan are tight.
.
.
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