Mitsubishi Electric FDF71VNXVD Technical Manual page 183

Error code
Indoor control PCB
Remote controller: E41
Outdoor control PCB
1. Applicable model
FDC200, 250 models
2. Error detection method
When anomalously high
temperature is detected by power
transistor temperature thermistor
(Tho-P1)
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
• Power transistor temperture
thermistor anomaly
• Inadequate installation space
of outdoor unit
Note :
LED Green
Keeps flashing
Keeps flashing
Outdoor
Yellow
inverter
6 times flash
PCB
5. Troubleshooting
possible to reset the error
for 10 minuted after compressor
YES
installation space of outdoor
Is the outdoor fan running?
characteristics of power transitor
temperature thermistor
connection of power transitor
temperature thermistor
fixing of power transistor
to radiator fin OK?
Application of radiating silicone
YES Does the error recur?
* Characteristics of power transistor temperature thermistor
(Broken wire)
Temperature-resistance characteristics
200
180
160
140
120
100
80
60
40
20
0
0 20
(Shot circuit)
Red
Content
Stays OFF
Power transistor overheat (2/2)
1 time flash
(Model FDC200 , 250 only)
Diagnosis
Is it
NO
Replace inverter PCB
stopped?
Can error be
reset?
Is the
NO
unit enough ?
Correct it
YES
NO
Replace the outdoor fan motor
YES or the outdoor control PCB
Are the
NO
OK?
Replace the power tansistor
temperature thermistor
YES
Is the
NO
connector OK?
Connect it securely
YES
Is the
Fixed screws
YES
40 60 80 100
Temperature (°C)
181
– –
'11 • PAC-T-160
Countermeasure
OK
YES
Replace power transistor
NO
Fix it properly
OK
NO
120 140