Midea MSV1-18HRDN1-QC2F, Service Manual

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10.2 Diagnosis and Solution
10.2.1 E0(EEPROM parameter error) error diagnosis and solution
10.2.2 E1(indoor / outdoor units communication protection) error diagnosis and solution
10.2.3 E2(zero-crossing signal error) diagnosis and solution
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?
NO
NO
Reconnect and retest again
Is the LED4 (red) on
outdoor PCB bright and
LED1(yellow) blinking?
Replace outdoor e-box.
Yes
Yes
The power supply for
outdoor PCB is fail. Check
the wiring on outdoor PCB
comparing with wiring plate.
Is the connection good?
No
Correct the connection.
Yes
No
Replace indoor PCB
and repower on. Is
the failure cleared?
Is power supply and
connection of connectors
good?
Indoor PCB is defective. Replace
the indoor PCB.
Be sure the power supply is good
and correct the connection
NO
YES
Circuit or software error on indoor PCB
Replace indoor PCB