Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 70

Error code
E6
Remote controller:
-
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-minute 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 connecion
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 characreristics of indoor heat
exchanger temperature thermistor (Thi-R1, R2, R3)
68
–
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)
–
Countermeasure
Insert the connector
securely
Replace thermistor
(Thi-R)
Replace indoor control
PCB