Mitsubishi Heavy Industries SRK Series Specifications Page 44

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Trouble of outdoor unit
[Broken power transistor
broken compressor wire]
Outdoor fan motor error
[Defective fan motor, connector
poor connection, defective PCB]
Is connector connection good?
YES
NO
NO
Is the output of the outdoor unit’s
printed circuit board normal?
Normal
NO
YES
YES
Correct connector connection
Is DC fan motor resistance value good?
Replace indoor PCB
Replace outdoor fan motor
Notes (1) See pages 49 for the DC fan motor and outdoor unit circuit
board check procedure.
(2) After making sure the DC fan motor and outdoor unit circuit
board are normal, connect the connectors and confirm that
the fan motor is turning.
(If power is turned on while one or the other is broken down,
it could cause the other to break down also.)
* Disconnect the fan motor con-
nector, then investigate the
DC fan motor and outdoor
unit circuit board separately.
Indoor fan motor error
[Defective fan motor, connector
poor connection, defective PCB]
Is connector connection good?
YES
NO
NO
Is the output of the indoor unit’s
printed circuit board normal?
Normal
NO
YES
YES
Correct connector connection
Is DC fan motor resistance value good?
Replace indoor PCB
Replace indoor fan motor
Notes (1) See pages 45 for the DC fan motor and indoor unit circuit
board check procedure.
(2) After making sure the DC fan motor and indoor unit circuit
board are normal, connect the connectors and confirm that
the fan motor is turning.
(If power is turned on while one or the other is broken down,
it could cause the other to break down also.)
* Disconnect the fan motor
connector, then investigate
the DC fan motor and indoor
unit circuit board separately.
Is output voltage applied to all 3
phases of power transistor?
(Refer to page 49 for details)
Defective inverter
Is compressor wiring connected
securely?
Connect securely.
Inspect compressor.
YES
YES
NO
NO
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