Sinclair SCV-1400EB, Service Manual

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148
 Wrong module board which does not correspond to the model;

Module board fault.
Procedure
L47
Spot check whether the dial code of the main control
board is corresponding to the unit model
Yes
Reset the dial code of the unit
model
NO
Whether the module board model match the
compressor mode
Yes
Change the drive board
NO
End
6.13 L50: Startup failure
Description

Compressor failed to start.

After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again.
Trigger/resume condition

Trigger condition: Compressor failed to start.
 Resume condition: After the compressor fails to start, the compressor restarts again. The fault is recovered after successful
restart.

Reset method: Automatic recovery after successful restart.
Possible causes

There is a pressure difference when the system starts;
 Compressor stuck.
Procedure
L50
Spot check whether the dial code of the main control
board is corresponding to the unit model
Yes
Reset the dial code of the
unit model
NO
Whether the module board model match the
compressor mode
Yes
Change the drive board
NO
End
6.14 L52: Zero speed protection
Description

Compressor locks rotor.

After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again.
Trigger/resume condition

Trigger condition: Compressor locks rotor.

Resume condition: Troubleshoot locked rotor.

Reset method: Automatic recovery after reaching the fault exit condition.
Possible causes
 Impurities in the system or lack of lubricating oil.