Ec55 (Outdoor Ipm Module Temperature Sensor Fault) Diagnosis And Solution - Mars Comfort-Aire Century VCD-SA Series Service Manual

7.20 EC55 (Outdoor IPM module temperature sensor fault) diagnosis and solution

Description: If the sampling voltage is 0V or 5V, the LED displays the failure code.
Recommended parts to prepare:
• IPM module PCB
• Connection wires
• Sensors
• Outdoor main PCB
Troubleshooting and repair:
If the radiator has no sensor, follow the steps below to resolve,
Power off, then restart the unit after 2 minutes.
Replace the IPM module PCB
If the radiator has a sensor(TH), follow the steps below to resolve,
Does a problem remain?
YES
Check whether the
fastening screws on the
PCB and IPM radiator are
fixed tightly
YES
Check the connection between
temperature sensor and PCB.
Is it properly wired?
YES
Measure the resistance value
of the sensor.
Is it within acceptable
parameters?
YES
Replace the outdoor main PCB
 Troubleshooting 43
NO The unit is operating normally
Tighten the screws and apply
NO
silicon grease
NO Ensure proper connections.
NO Replace the sensor.

Service Manual - VCDxxSA