Midea M2OC-18HRDN1-M - Page 29

Indoor unit display LED STATUS
E6 Open or short circuit of room or evaporator coil temperature sensor
Indoor unit display LED STATUS
P0 Inverter module protection
Indoor unit display LED STATUS
P1 Over voltage or too low voltage protection
Is the power supply good?
Be sure the power supply is
normal when using the units
NO
YES
Replace the outdoor e-box.
Is the indoor temperature
and evaporator sensor
connector and connection
good?
Repair the connector and
reconnect
Replace the sensor and
check if E6 display again?
NO
YES
Replace the.indoor PCB
YES
No
Yes
No
Yes
Yes
Check the connectors in outdoor PCBs。Is connection to connector
good?
Is the wires to compressor right
Check the outdoor inverter module。
Is it breakdown between
P-N,P-U,P-V; P-W;N-W,N-U,N-V
At inverter module
Normally, P-N: ~1.0MΏ, P-U: ~2.0MΏ
P-V: ~2.0M
Ώ
, P-V: ~2.0M
Ώ
; N-W: ~1.0M
Ώ
Check compressor
Check the resistance between the terminal U, V, W with multimeter, if Ruv=Ruw=Rwv, it is
OK. Otherwise, to replace the compressor.
Inverter module is defective,
Repair connector