Seconds Continuously Within 2 Minutes To 2 Minutes; On, The Compressor Stops. After 3-Minutes Delay, The Compressor; When -55 °C Or Lower Is Detected For 5 Seconds Continuously Within - Mitsubishi Electric FDT71VNPWVH Service Manual

Error code
Remote control:
E37
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the outdoor heat exchanger
temperature sensor
3. Condition of Error displayed
• When the temperature sensor
detects -55 °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 -55 °C or lower is
detected for 5 seconds
continuously within 20
seconds after power ON.
4. Presumable cause
• Defective outdoor unit PCB
• Broken sensor harness or
temperature sensing section
• Disconnected wire connection
(connector)
Note:
LED Green Red
Indoor Keeps flashing Stays OFF
5. Troubleshooting
Diagnosis
Is the
outdoor heat
exchanger temperature
sensor connector
connected
properly?
YES
For the characteristics of outdoor heat exchanger
temperature sensor, see the following graph.
Are the
characteristics of
outdoor heat exchanger
temperature
sensor
OK?
Temperature-resistance characteristics
(Broken wire)
15
10
5
(Short-circuit)
0
97
-
Content
Outdoor heat exchanger
temperature sensor anomaly
NO
NO
YES
5kΩ at 25°C
10 20 30 40 50
Temperature (°C)
-
'19 • PAC-SM-312
Countermeasure
Correct connector.
Defective outdoor heat
exchanger temperature
sensor➞Replace.
Defective outdoor unit
PCB➞Replace.
(Defective outdoor heat
exchanger temperature
sensor input circuit)