Carrier 38MGRQ30D 3 Series - Outdoor Fan Speed Out of Control (E8)

50 Specifications subject to change without notice. 38MGR-04SM
DIAGNOSIS AND SOLUTION (CONT)
Outdoor fan speed has been out of control (E8)
Troubleshooting
ERROR CODE E8
MALFUNCTION DECISION
CONDITIONS
When the outdoor fan speed stays too low (300RPM) or too high (2400RPM) for certain time, the unit
stops and the LED displays the failure.
SUPPOSED CAUSES
• Wiring mistake
• Fan assembly faulty
• Fan motor faulty
• PCB faulty
No
Yes
No
No
Yes
Yes
No
Yes
No
Power o, then restart the unit
3 minutes later.
Is it still displaying the error code?
The unit operates normally.
Shut o the power supply,
rotate the fan by hand.
Does it rotate properly?
Determine the cause and
resolve it.
For example, if the fan is
blocked or the screws
which secure the fan
are tightened.
Check the fan motor wiring.
Are all of the connections good?
Correct the connections.
Check whether the main PCB is
normal (see Index 1).
Replace the main PCB.
Replace the fan motor.