Diagnosis And Solution - Midea MSC-09HRDN1-QD0(E) Service Manual

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
inoor 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.
10.2.3 E2(zero-crossing signal error) diagnosis and solution
Is power supply and
connection of connectors
good?
10.2.4 E3(indoor fan speed out of control) diagnosis and solution
NO
Yes
No
No
YES
NO
Yes
Yes
NO
Be sure the power supply is good
and correct the connection
Indoor PCB is defective. Replace
the indoor PCB.
Reconnect and retest again
Replace indoor PCB
and repower on. Is
the failure cleared?
Replace outdoor e-box.
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