Midea MSY-09HRDN1-QC2, Service Manual

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9.2 Diagnosis and Solution
9.2.1 E0 (EEPROM parameter error) error diagnosis and solution
9.2.2 E1 (indoor / outdoor units communication protection) error diagnosis and solution
9.2.3 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
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