Sinclair SCV-750EB Service Manual page 116

5.21 PL/C7 Troubleshooting
Digital display output
Description
 PL indicates inverter module temperature protection. When the main inverter module temperature rises above 100
system displays PL protection and all the units stop running. When the inverter module temperature drops below 70°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.

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.

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