Midea M2OC-14HRDN1 Technical & Service Manual page 27

8.3Trouble shooting
8.3.1 EEPROM parameter error diagnosis and solution
Shut off the power supply and turn on it 5s later
Is the EEPROM chip plugged in PCB well?
Replace the PCB
8.3.2 Indoor / outdoor units communication protection(Only for M5OA-36HRDN1-Q model)
Disconnect the power supply, after 1
minute, connect the power supply , turn on
the unit with remote controller
Does the unit work
normally ?
Check the wiring between
indoor and outdoor unit. Is
the connection of L, N, S
and GND good?
Is the GND connection on
outdoor PCB good?
Is the LED4(red) on
outdoor PCB bright and
LED1(yellow) blinking?
The power supply for
outdoor PCB is fail. Check
the wiring on outdoor PCB
comparing with wiring plate.
Is the connection good?
Correct the connection
The problem comes out again
No
Yes
No
No
.
No
Correct the connection
No
Yes
Yes
ODMI-1103-A
Reconnect and retest
in
Replace indoor PCB
and repower on. Is
the failure cleared?
No
Replace outdoor e-box.