Service Manual

8.4.2.7 E8 (Outdoor fan speed has been out of control) diagnosis and solution
Error Code
E8
Malfunction decision
conditions
When outdoor fan speed keeps too low (300RPM) or too high(2400RPM)
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 3 minutes later. Is it still
displaying the error code?
Power off, then restart the
unit 3 minutes later. Is it still
displaying the error code?
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
The unit operates normally.
The unit operates normally.
Find out the cause and
have it solved. For
example, whether the fan
is blocked or the screws
which fix the fan are
tighten.
Find out the cause and
have it solved. For
example, whether the fan
is blocked or the screws
which fix the fan are
tighten.
Check the wiring of fan
motor. Are all the
connections good?
Check the wiring of fan
motor. Are all the
connections good?
No
Yes
No
Correct the connections.
Correct the connections.No
Replace the fan motor
Replace the fan motor
Yes
Yes
Replace the main PCB
Replace the main PCBNo
Check whether the main PCB
is normal through index 1?
Check whether the main PCB
is normal through index 1?
Yes
No
Index 1: