M thermal Mono
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Condition 4: L0 error appears after the compressor has been running for a period of time and the compressor speed is
over 60rps
L0
Inverter module has overheated
Yes
Repaint the thermally conductive silica
gel on the PFC and IPM modules (on the
reverse side of the inverter module PCB)
1
No
Inverter module is over-current
2
Yes
Replace the compressor
No
Replace the inverter module
2
Notes:
1. When replacing an inverter module, a layer of thermally conductive silica gel should be painted on the IPM module (on the reverse side of the inverter
module PCB). Refer to Figure 4-4.3.
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 has failed.
Situation 5: L0 error appears occasionally/irregularly
L0
The outdoor unit ventilation is not good
Yes
Ensure enough space for unit ventilation
Midea CAC
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