R410A All DC Inverter V5 X Series 50Hz MCAC-VTSM-2015-10
162 Troubleshooting
4.27 PL: Temperature protection of main inverter module
4.28 C7: PL protection appears three times in 100 minutes
When the temperature of inverter module is over 80
o
C, it will display PL protection.
If the system displays PL protection three times in 100 minutes, the system will stop and display C7 error code.
When the system displays C7 error code, the system can resume only by restarting the machine.
* How to check for the temperature sensor
Using a multi-meter to measure resistance, if the resistance is too low, the sensor is short circuit, if the resistance at certain
temperature is not consistent with attached table 2, the sensor is disabled
The screw between inverter
module and radiating fin is
Outdoor main PCB is damaged
Replace the outdoor main PCB
Temperature sensor of main
inverter module has short
circuited or is disabled*.
Tighten the screw; make sure
the inverter module is closed to
the radiating fin
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