Eh 03 / Ec 07 (Fan Speed Is Operating Outside Of The Normal Range )/Ec - Mars Comfort-Aire Century VCD-SA Series Service Manual

7.3 EH 03 / 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:
Power off, then restart the unit after 2 minutes.
Does a problem remain?
Shut off the power supply, Rotate
Check the wiring of fan motor.
Is it improperly wired?
Measure the voltage for
the fan motor from the PCB.
Is it within normal parameters?
Replace the fan motor
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.
YES
the fan by hand.
Does it turn easily?
YES
YES
YES
 Troubleshooting 25
NO The unit is operating normally
NO Find the cause of the problem and resolve it
Ensure proper connections
NO Replace the main PCB

Service Manual - VCDxxSA