Sinclair SCV-EB Series Service Manual page 78

Replace the inverter module
Notes:
1. Use clip-on ammeter to measure the compressor current, if the current is normal indicates the inverter module is failed, if the current is abnormal
indicates the compressor is failed.
2. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the PFC and IPM modules (on the reverse side of the
inverter module PCB).
Situation 3: L0 error appears occasionally/irregularly
The outdoor unit ventilation is not good
5.28.5 L1/L2 troubleshooting
The normal DC voltage between terminals P and N on inverter module is 1.4 time of AC power supply in standby , the DC
voltage is 377V when the fan motor is running. If the voltage is lower than 135V, the unit displays L1. If the voltage is
higher than 500V, the unit display L2.
Inverter module terminals (5-9KW)
N
Situation 1: L1 or L2 error appears immediately after the outdoor unit is powered-on
Power supply is abnormal
Replace the inverter module
76
2
L0
P U V W
L1 / L2
No
1
Yes
Ensure enough space for unit ventilation
Inverter module terminals (12-16KW)
N
Re-start the unit once the power supply
Yes
has returned to normal
P U V W