E37 Outdoor Heat Exchanger Temperature Thermistor Anomaly - Mitsubishi Electric FDF100VSXVD Technical Manual

Error code
E37
Remote controller:
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the outdoor heat exchanger
temperature thermistor
3. Condition of Error displayed
• When the temperature thermistor
detects -50°C or lower for 20
seconds continuously within 2
minutes to 2 minutes 20 seconds
after the compressor ON, the
compressor stops. After 3-minutes
delay, the compressor starts again
automatically, but if this anomalous
temperature is detected 3 times
within 40 minutes.
• When -50°C or lower is detected for 5
seconds continuously within 20 second
after compressor ON.
4. Presumable cause
• Defective outdoor control
PCB
• Broken thermistor harness or
temperature sensing section
• Disconnected wire connection
(connector)
Note:
L E D G r een Red
Stays OFF
Indoor
Outdoor
5. Troubleshooting
Diagnosis
Is the
outdoor heat
exchanger temperature
thermistor connector
connected
properly?
YES
For the characteristics of outdoor heat exchanger
temperature thermistor, see the following graph.
Are the
characteristics of
outdoor heat exchanger
temperature
thermistor
OK?
Temperature-resistance characteristics
(Broken wire)
15
10
5
(Shot circuit)
0
- 176
Content
Outdoor heat exchanger
temperature themistor anomaly
NO
NO
YES
5k at 25°C
10 20 30 40 50
Temperature (°C)
-
'11 • PAC-T-160
Countermeasure
Correct connector.
Defective outdoor heat
exchanger temperature
thermistor Replace.
Defective outdoor control
PCB Replace.
(Defective outdoor heat
exchanger temperature
thermistor input circuit)