38MBRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
21
EC 07 (Fan Speed Is Operating Outside of Normal Range)/EC 71(Over Current Failure of Outdoor DC
Fan Motor)/ EC73 (Zero-speed 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 o , 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 o the power supply , r otate
the fan by hand .
YES
Does it turn easily ?
Find the cause of the problem and solve
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 PCBNO
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