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4.20 PL/C7 Troubleshooting
4.20.1 Digital display output
4.20.2 Description
▪ PL indicates inverter module temperature protection. When the main inverter module temperature rises above 82°C,
the system displays PL protection and all the units stop running. When the inverter module temperature drops below
60°C, the compressor enters re-start control
▪ When a PL error occurs 3 times in 100 minutes, C7 will display, a manual system restart is required before the system
can resume operation.
▪ Error code is displayed on the main PCB and user interface.
4.20.3 Possible causes
▪ Blocked, dirty or loose heat sink.
▪ Temperature sensor not connected properly or has malfunctioned.
▪ Fan motor wiring connection is wrong.
▪ Main PCB damaged.
