Sinclair SCV-750EB Service Manual page 120

5.23 F0 Troubleshooting
Digital display output
Description
1F0 indicates a communication error between the main control chip and the compressor A inverter driver chip.

2F0 indicates a communication error between the main control chip and the compressor B inverter driver chip.

All units stop running.

 Error code is only displayed on the unit with the error.
Trigger / recover condition
Trigger condition: Main control chip and inverter driver chip cannot communication for 2 minutes.

Recover condition: Communication go back to normal.

Reset method: Resume automatically.

Possible causes
Incorrect compressor inverter module address setting.

Loosened communication wiring from the main PCB to

the inverter module.
Procedure,
For SCV-750EB and SCV-1400EB
Compressor inverter module address setting
Communication wire from outdoor main
PCB CN26 to inverter module CN8/CN9 is
LED3 on inverter module are off when
Replace the outdoor main PCB, is the
Replace the inverter module
118
F0 error
is incorrect
No
loosened 2
No
3
power on
No
malfunction solved?
No
Bridge rectifier damaged.

Main PCB damaged.

Compressor inverter module damaged.

Reset the compressor inverter
Yes
module address via dial switch
S7 on inverter module
Yes
Reconnect the communication
wire
Yes
Check the power supply circuit
Yes
Normal
1
4