Sinclair SCV-750EB Service Manual page 149

Possible causes
The main controller's capacity dial or model dial is set incorrectly;

The matching model of the module board is incorrectly selected;

The main board circuit or the module board circuit is abnormal.

Procedure
Spot check whether the unit model matches the dial
code of the model on the main control board
Whether the model of the module board matches
6.11 L46: IPM protection (FO)
Description
The FO signal of the IPM module has a falling edge or a continuous low level.

After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again.

Trigger/resume condition
Trigger condition: The FO signal of the IPM module has a falling edge or a continuous low level.

Resume condition: The FO signal of the IPM module turns into high level.

Reset method: Automatic recovery after reaching the fault exit condition one minute later.

Possible causes
Internal short circuit of the IPM module;

Short circuit of compressor winding;

System condensation results in short circuit of IPM module pins;

 The drive voltage of the lower bridge IGBT of the IPM module is lower than 10.3V;
The module board is abnormal.

Procedure
Compressor winding and insulation failure
Replace the drive board of the matching model
6.12 L47: Module type not match
Description
The driver board detected by the module detection resistor does not match the setting in the driver parameter table.

Trigger/resume condition
Trigger condition: The current level of the drive board and the compressor information detected by the module detection

resistor do not match the settings in the drive parameter table.
Resume condition: Change the module board.

Reset method: Re-select the module board corresponding to the model, then power off and restart.

Possible causes
The main control capacity dial code and model selection are wrong;

L45
Yes
the model of the compressor
L46
Report error while in standby
NO
NO
No
reset model dial
Yes
Change the driver board
Yes
Change the drive board
Yes
Change the compressor
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