Midea M-Thermal Series Service Manual page 75

M‐Thermal Split
Situation 3: L0 or L4 error appears after the compressor has been running for a period of time and the compressor
speed is over 60rps
Inverter module has overheated
Inverter module is over‐current
Replace the inverter module
Notes:
1. Refer to Figure 4‐4.1.
2. 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.
3. 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). Refer to Figure 4‐4.1.
Situation 4: L0 error appears occasionally/irregularly
The outdoor unit ventilation is not good
74
L0 / L4
No
2
No
3
L0
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Repaint the thermally conductie silica
gel on the IPM module, IGBT, diode,
Yes
brigde rectifer (on the reverse side of
the inverter module PCB)
Yes
Replace the compressor
Yes
Ensure enough space for unit ventilation
1
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