E6 Indoor Heat Exchanger Temperature Thermistor Anomaly - Mitsubishi Heavy Industries SRK20ZJX-S Service Manual

Error code
Remote controller:
E6
1. Applicable model
All models
2. Error detection method
Anomalously low temperature
or high temperature (resistance)
is detected on the indoor heat
exchanger thermistor (ThI-R1,
R2 or R3).
3. Condition of Error displayed
• When the temperature
thermistor detects -50°C
or lower for 5 seconds
continuously, the compressor
stops. After 3-minutes delay,
the compressor starts again
automatically, but if this
error occurs again within
60 minutes after the initial
detection.
• Or if 70°C or higher is
detected for 5 seconds
continuously.
4. Presumable cause
• Defective indoor heat
exchanger thermistor
connector
• Indoor heat exchanger
temperature thermistor
anomaly
• Faulty indoor control PCB
Note:
LED Green Red
Indoor Keeps flashing 1 time flash
Outdoor – Stays OFF
5. Troubleshooting
Diagnosis
Is the
connection of indoor heat
exchanger temperature thermistor
connector OK?
YES
Are
characteristics of indoor
heat exchanger temperature
thermistor OK?
Temperature-resistance characteristic
(Broken wire)
15
10
5
(Shot circuit)
0 10
Temperature (°C)
92
-
Content
Indoor heat exchanger
temperature thermistor anomaly
NO
NO
YES
°C
5k at 25
20 30 40 50
-
'10 • SCM-SM-094
Countermeasure
Correct. Insert connector
securely.
Defective indoor heat
exchanger temperature
thermistor Replace.
Defective indoor control
PCB Replace.
(Defective indoor unit heat
exchanger temperature
thermistor input circuit)