Sinclair SCV-1400EB, Service Manual

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5.21 PL/C7 Troubleshooting
Digital display output
Description

PL indicates inverter module temperature protection. When the main inverter module temperature rises above 100 o C, the
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.