Sinclair SDV5 Series Service Manual page 68

2.22.5 Procedure
Power off for 3 minutes and then repower on to check
Spot check the 8
TF is over 90℃ in outdoor unit operation period
Spot check the 9
is too high ,and Inspect whether the refrigerant cooling
tube and radiator is contacted well
System or installation problem
2.23 L0/L4/L5/L8/L9: L category of inverter module protection (L0 for all models, L4/L5/L8/L9 for 100-160
model)
2.23.1 Digital display output
L0/L4/L5/L8/L9
2.23.2 Description
 Compressor inverter module protection.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.23.3 Trigger / recover condition
 Trigger condition: Inverter module or compressor is abnormal.
 Recover condition: Inverter module and compressor goes back to normal.
 Reset method: Manually restart.
2.23.4 Possible causes
 Power supply is abnormal.
 Refrigerant cooling module is abnormal.
 Compressor is abnormal.
 Outdoor unit main control board damaged.
2.23.5 L0/L4: Procedure
U V W wires between inverter module
and compressor is not connected
PL
whether PL fault is cleared
No
th
TF temperature to confirm whether
Yes
th
TL temperature to confirm whether TL
Yes
L0 / L4
properly
Yes
No
No
Main control board damaged
Yes
Ensure U V W wire is connected properly
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