Midea Mini C Series Service Manual page 82

2.23.8 L1: Procedure
Voltage of power supply is 166-265V?
Check the wiring between main control board and
filter board is correct or not.
Repower on and waiting for 10S,and then test the
voltage of CN4 port "RL" and "12V" port to check
whether their voltage is DC 12V
Replace outdoor filter board
2.23.9 L2 : Procedure
Voltage of power supply is 166-265V?
Replace outdoor main PCB
2.23.10 Compressor replacement procedure
Step 1: Remove faulty compressor and remove oil
 Remove the faulty compressor from the outdoor unit.
 Before removing the oil, shake the compressor so as to not allow
impurities to remain settled at the bottom.
 Drain the oil out of the compressor and retain it for inspection.
Normally the oil can be drained out from the compressor discharge
pipe.
Step 2: Inspect oil from faulty compressor
 The oil should be clear and transparent. Slightly yellow oil is not an indication of any problems. However, if the oil is
dark, black or contains impurities, the system has problems and the oil needs to be changed. Refer to Figure 6-2.7 for
further details regarding inspecting compressor oil. (If the compressor oil has been spoiled, the compressor will not be
being lubricated effectively. The scroll plate, crankshaft and bearings will wear. Abrasion will lead to a larger load and
higher current. More electric energy will get dissipated as heat and the temperature of the motor will become
increasingly high. Finally, compressor damage or burnout will result.)
L1
Yes
Yes
Yes
L2
Mini C Series VRF 50/60Hz
No
Provide normal power supply
No
No
Replace outdoor main PCB
No
Provide normal power supply
Figure 6-2.5: Draining oil from a compressor
Connect again
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