Applicable Model; Error Detection Method; Condition Of Error Displayed - Mitsubishi Electric FDT71VNPWVH Service Manual

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 thermistor (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-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 sensor connector
• Indoor heat exchanger
temperature sensor anomaly
• Faulty indoor unit control PCB
Note:
LED Green Red
Keeps flashing 1-time flash
Indoor
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)
82
-
Content
Indoor heat exchanger
temperature sensor anomaly
NO
NO
YES
°C
5kΩ at 25
20 30 40 50
-
'19 • PAC-SM-312
Countermeasure
Correct. ➞ Insert connector
securely.
Defective indoor heat
exchanger temperature
sensor ➞ Replace.
Defective indoor unit
control PCB ➞ Replace.
(Defective indoor unit heat
exchanger temperature
sensor input circuit)