Are The Characteristics Of; Yes; Temperature (°C) - Mitsubishi Heavy Industries SRK20ZS-W Technical 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 5
seconds continuously within 2
minutes to 2 minutes 20 seconds
after the compressor ON, the
compressor stops. After 3-minute
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 compressor ON.
4. Presumable cause
• Defective outdoor unit PCB
• Broken sensor harness or
temperature sensing section
• Disconnected wire connection
(connector)
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
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
236
-
Content
Outdoor heat exchanger
temperature sensor anomaly
NO
NO
YES
5kΩ at 25°C
10 20 30 40 50
Temperature (°C)
-
'21 • SRK-T-299
Countermeasure
Correct connector.
Defective outdoor heat
exchanger temperature
sensor➞Replace.
Defective outdoor unit
PCB➞Replace.
(Defective outdoor heat
exchanger temperature
sensor input circuit)