L4: Mce Error - Midea V6-i Series Service Manual

2.13.9

L4: MCE error

Compressor wiring is not properly
Disconnect
the power
supply
Inverter module address setting
discharge temperature sensor wiring is
The resistance between 3 phases of
Replace the compressor inverter
board, restart the unit and the error is
Refer to P1 or P3 troubleshooting
Notes:
1. Compressor inverter module address is set through dial switch S7 on the inverter module. The compressor inverter module A/B location refers to the
wiring diagram.
L4 protection
ODU ventilation is not good
No
ODU stop valves are closed
No
No
not properly
No
compressor is over 5Ω
No
The insulation resistance of
compressor is less than 100Ω
No
solved
No
S7 on inverter module
Yes
Remove barriers from heat
exchanger and air outlet of ODU
Yes
Yes
Reconnect the cables based on
1
and
Reset the inverter module address
Yes
and reconnect the discharge
temperature sensor cables
Yes
Yes
Yes
Inverter module address
0 for compressor inverter module A
1 for compressor inverter module B
V6-i VRF 50/60Hz
Open the ODU stop valves
wiring diagram
Replace the compressor
Normal
99