Diagnosis And Solution - Toyotomi Kuro MTN A228DV Service Manual

10.2 Diagnosis and Solution

10.2.1 EEPROM parameter error diagnosis and solution
Circuit or software error on indoor PCB
102.2 Indoor / outdoor units communication protection 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?
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 Zero-crossing signal error diagnosis and solution
Is power supply and
connection of connectors
good?
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.
Replace indoor PCB
Reconnect and retest again
Replace indoor PCB
and repower on. Is
the failure cleared?
Replace outdoor e-box.
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