Mitsubishi MT300 User Manual

'10 • HM-T-149A
48
Service
Troubleshooting guide
E45 - Inverter communication error
Is the communication between
the co ntrol PCB and the inverter
PCB OK?
Correct the connection
Are JSW10, 11 on the inverter
PCB all set correctly ?
Set JSW10, 11 correctly
NO
YES
Does the LED on the inverter
PCB flash?
NO
YES
Is the voltage 15VDC detected
between ② and ③ of CNI3 on
the co ntrol PCB side?
Replace the outdoor
fan motor
Note (3): Under anomalous conditions,
the voltage becom es less than 14VDC.
(2) (3)
Is the voltage 15VDC detected
after disconnecting the
connector of outdoor fan motor?
(1)
Replace the ourdoor control PCB
Has the fault been corrected?
Replace the inverter PCB
If not solved yet, replace
the no ise filter PCB as well.
OK
YES
Note (2): How to check voltage at
CN13 ⇒See E51.
NO
YES
YES
NO
Connect the signal wire
securely
YES
Is the connection of signal wire
between inverter PCB and
outdoor control PCB OK?
Note (1): See page 180 & 181
of manual '10-HM-T149
(3)
NO
YES
Replace the inverter PCB
NO
NO
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168
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Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English