Eh 03 / Ec 07 (Fan Speed Is Operating Outside Of The Normal Range )/Ec 71(Over Current Failure Of Outdoor Dc Fan Motor) Diagnosis And Solution - MrCool DIY-MULTI2-18HP230C Service Manual

8.3 EH 03 / EC 07 (Fan Speed Is Operating Outside of Normal Range)/EC 71(Over Current
Failure of Outdoor DC Fan Motor) Diagnosis and Solution
Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the LED displays the failure
code and the AC turns off.
Recommended parts to prepare:
• Connection wires
• Fan assembly
• Fan motor
• PCB
Troubleshooting and repair:
Power off, then restart the unit after 2 minutes.
Shut off the power supply, Rotate
Check the wiring of fan motor.
the fan motor from the PCB.
Is it within normal parameters?
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole.
Does a problem remain?
YES
the fan by hand.
Does it turn easily?
YES
Is it improperly wired?
YES
Measure the voltage for
YES
Replace the fan motor

NO The unit is operating normally
NO Find the cause of the problem and resolve it
Ensure proper connections
NO Replace the manr PCB
Troubleshooting 31 