Midea M2OC-18HFN1-M Service Manual page 73

9.4.2.7 E8(Outdoor fan speed has been out of control) diagnosis and solution(Only for DC fan motor
models).
Error Code
Malfunction decision
conditions
Supposed causes
Trouble shooting:
Shut off the power supply
and turn it on 1 minute
later. Is it still displaying
the error code?
Shut off the power supply,
rotate the fan by hand.
Does it rotate properly?
Check the wires of fan
motor. Are all the
connections good?
Check whether the fan
motor is normal through
Check whether the main PCB is
normal through index 2?
E8
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.
● Wiring mistake
● Fan ass'y faulty
● Fan motor faulty
●
PCB faulty
Yes
Yes
Yes
index 1?
Yes
No The unit operates normally.
No
No
Replace the fan
No
motor
No
Replace the
main PCB.
No The
malfunction is
solved?
Yes
Find out the cause and
have it solved. For
example, check
whether the fan is
blocked or the bearing
is broken?
Correct the connections.
If the
malfunction is
still existing,
replace the
main PCB