Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 203

Error code
E6
Remote control:
1. Applicable model
All models
2. Error detection method
Anomalously low temperature
or high temperature (resistance)
is detected on the indoor heat
exchanger temperature sensor
(Thi-R1, R2 or R3).
3. Condition of error displayed
• When the temperature sensor
detects -50°C or lower for
5 seconds continuously,
the compressor stops.
After 3-minute 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 temperature sensor
connector
• Indoor heat exchanger
temperature sensor anomaly
• Faulty indoor unit control
PCB
Note:
LED Green Red
Keeps flashing 1-time flash
Indoor
Keeps flashing Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Is the
connection of indoor heat
exchanger temperature sensor
connector OK?
YES
Are
characteristics of indoor
heat exchanger temperature
sensor OK?
Temperature-resistance characteristic
(Broken wire)
15
10
5
(Short-circuit)
0 10
Temperature (°C)
202
-
Content
Indoor heat exchanger
temperature sensor anomaly
NO
NO
YES
°C
5kΩ at 25
20 30 40 50
-
'19 • PAC-T-327
Countermeasure
Correct. ➞ Insert connector
securely.
Defective indoor heat
exchanger temperature
sensor ➞ Replace.
Defective indoor unit
control PCB ➞ Replace.
(Defective indoor heat
exchanger temperature
sensor input circuit)