Mitsubishi FDT100VNXWVH Service Manual page 168

Error code Indoor display
Remote control:
E53
Outdoor unit
Outdoor unit
inverter PCB
1. Applicable model
All models
2. Error detection method
When the suction pipe
temperature sensor detects
anomalously low temperature
3. Condition of error displayed
If the temperature sensor
detects -50°C or lower for 5
seconds continuously within
10 minutes to 10 minutes 20
seconds after compressor ON,
the compressor stops. When
the compressor is restarted
automatically after 3-minute
delay, if this anomaly ocuurs 3
times within 40 minutes.
4. Presumable cause
• Defective suction pipe
temperature sensor connection
• Defective suction pipe
temperature sensor
• Defective outdoor unit control
PCB
Note:
RUN light
Keeps flashing
Green LED
Keeps flashing
control PCB
Yellow LED
Keeps flashing
5. Troubleshooting
of suction pipe temperature sensor
characteristics of suction pipe
temperature sensor OK?
(Broken wire)
15
10
(Short-circuit)
TIMER light
Content
5-time flash
Suction pipe temperature
Red LED
1-time flash
Diagnosis
Is the connection
connector OK?
YES
For the characteristics of suction pipe
temperature sensor, see the following graph.
Are the
Temperature-resistance characteristics
5kΩ at 25°C
5
0 10 20 30 40 50
Temperature (°C)
167
- -
'20 • PAC-SM-351
sensor anomaly
Countermeasure
Correct connection of
NO
suction pipe temperature
sensor connector.
Defective suction pipe
NO
temperature sensor ➞
Replace.
Defective outdoor unit
YES
control PCB ➞ Replace.
(Defective suction pipe
temperature sensor input
circuit)