Sinclair SCV-750EB Service Manual page 126

5.25 F6 Troubleshooting
Digital display output
Description
 1F6 indicates A system buss voltage error (PTC).
2F6 indicates B system buss voltage error (PTC).

Only occurred in standby status.

Error code is displayed on main PCB and user interface.

Possible causes
Abnormal power supply voltage

Loosened wiring within electric control box

High voltage circuit error

AC filter board damaged

3-pahse bridge rectifier damaged

Compressor Inverter module damaged

Procedure
Refer to P6 protection troubleshooting: xL1 and xL2.
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