Indoor Heat Exchanger Temperature Thermistor Anomaly (Thi-R) - Mitsubishi Heavy Industries Hi-COP Series Service Manual

Error code
E6
Remote control:
–
7-segment display:
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance)
of ThI-R1, R2, R3.
3. Condition of error displayed
• If -50ºC or lower is
detected for 5 seconds
continuously, compressor
stops. After 3-minutes delay,
the compressor is restarted
automatically, but if this
anomaly occurs again within
60 minutes after the initial
detection.
• Or if 70ºC or higher is
detected for 5 seconds
continuously.
4. Presumable cause
• Anomalous connection
of indoor heat exchanger
temperature thermistor
• Indoor heat exchanger
temperature thermistor
anomaly
• Indoor control PCB anomaly
Note:
LED Green Red
Keeps flashing 1-time flash
Indoor
Keeps flashing Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Is
the connector of
thermistor connected
properly ?
YES
Are
the characteristics
of thermistor OK?
*1
*1 Check several times to prove any poor connection
Temperature-resistance characteristics of indoor heat
exchanger temperature thermistor (ThI-R1, R2, R3)
90
–
Indoor heat exchanger
Content
temperature thermistor anomaly (ThI-R)
NO
Regarding the characteristics of
the thermistor, see the following chart.
NO
YES
5kΩ at 25ºC
Temperature (ºC)
–
'14 • KX-SM-204
Countermeasure
Insert the connector
securely.
Replace thermistor.
(ThI-R)
Replace indoor control.
PCB