Mitsubishi Heavy Industries FDUA160AVSAVH Service Manual page 96

Error code
Indoor control PCB
Remote control:
E41
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
When anomalously high
temperature is detected by
power transistor
3. Condition of error displayed
Anomalously high temperature
of power transistor is detected 5
times within 60 minutes.
4. Presumable cause
• Inverter PCB anomaly
• Outdoor fan motor anomaly
• Improperly fixing of power
transistor to radiator fin
• Inadequate installation space
of outdoor unit
• Outdoor unit control PCB
anomaly
• Power transistor module
anomaly
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
8-time flash
5. Troubleshooting
Is it possible to
reset the error for 10 minutes after
compressor stopped?
YES
Is the
installation space of outdoor
unit enough?
YES
Is the outdoor fan running?
YES
Is the fixing
of power transistor to radiator fin OK?
・ Fixed screw
・ Application of radiating
silicone
YES
Does the error recur?
Red
Content
Stays OFF
1-time flash
Power transistor overheat
Diagnosis
NO
Replace inverter PCB.
NO
Can error be reset?
NO
Correct it.
NO
Replace the outdoor fan motor or the
outdoor unit control PCB.
NO
YES
NO
95
- -
'21 • PAC-SM-398
Countermeasure
OK
YES
Replace power transistor.
NO
Fix properly.
Defective inverter PCB➞
Replace.
OK