Troubleshooting
Page 61
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 unit ceases operation
and the LED displays the failure.
Recommended parts to prepare:
• Connection wires
• Fan assembly
• Fan motor
• PCB
Troubleshooting and repair:
YES
Power off, then restart the unit after 2 minutes.
Is it within normal parameters?
Replace the fan motor
Does a problem remain?
The unit is operating normally
NO
Shut off the power supply, Rotate
the fan by hand.
YES
Does it turn easily?
Find the cause of the problem and resolve it
NO
Check the wiring of fan motor.
YES
Is it improperly wired?
Ensure proper connections
Measure the voltage for
the fan motor from the PCB.
YES
Replace the main PCB
NO
Replace the DC fan IPM board (if
has)
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.
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