Mitsubishi Heavy Industries FDT71VNXVD Service Manual page 87

Error code
Remote controller: E53
1. Applicable model
All models
2. Error detection method
When the suction pipe
temperature thermistor detects
anomalously low temperature
3. Condition of Error displayed
If the temperature thermistor
detects -50°C or lower for 5
seconds continuously within
10 minutes to 10 minutes 20
seconds after compressor ON,
the compressor stops. When
the compressor is restarted
automatically after 3-minutes
delay, if this anomaly ocuurs 3
times within 40 minute.
4. Presumable cause
• Defective suction pipe
temperature thermistor
connection
• Defective suction pipe
temperature thermistor
• Defective outdoor control
PCB
Note:
LED Green Red
Content
Indoor Keeps flashing Stays OFF
Outdoor 1 time flash
Keeps flashing
5. Troubleshooting
Diagnosis
Is the connection
of suction pipe temperature thermistor
connector OK?
YES
Are the
characteristics of suction pipe
temperature thermistor OK?
Temperature-resistance characteristics
(Broken wire)
15
10
5
(Shot circuit)
0 10
Temperature (°C)
87 97
– –
Suction pipe temperature
thermistor anomaly
NO
NO
YES
5k at 25°C
20 30 40 50
'10 • PAC-SM-137A
Countermeasure
Correct connection of
suction pipe temperature
thermistor connector.
Defective suction pipe
temperature thermistor
Replace.
Defective outdoor control
PCB Replace.
(Defective suction pipe
temperature thermistor
input circuit)