Discharge Pipe Temperature Sensor Anomaly - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

Error code
Remote controller: E39
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the discharge pipe temperature
sensor
3. Condition of Error displayed
When the temperature sensor
detects -25 °C or lower for 5
seconds continuously within
10 minutes to 10 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.
4. Presumable cause
• Defective outdoor main PCB
• Broken sensor harness or
temperature sensing section
(Check molding.)
• Disconnected wire connection
(connector)
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
Outdoor – 8 times flash
5. Troubleshooting
Diagnosis
Is the
discharge pipe
temperature sensor
connector connected
properly?
YES
Are the
characteristics
of discharge pipe
temperature
sensor
OK?
Temperature-resistance characteristics
(Broken wire)
100
50
0
[T 90 ]
°C 0 20
(Shot circuit)
104
-
Content
Discharge pipe
temperature sensor anomaly
NO
For the characteristics of discharge pipe
temperature sensor, see the following graph.
NO
YES
40 60 80 100 120
Temperature (°C)
-
'10 • SCM-SM-094
Countermeasure
Correct connector.
Defective discharge pipe
temperature sensor
Replace.
Defective outdoor main
PCB Replace.
(Defective temperature
sensor input circuit)
140