Mitsubishi FDT71VH - Page 168

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167
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'20 • PAC-SM-351
E53
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
YES
NO
Are the
characteristics of suction pipe
temperature sensor OK?
For the characteristics of suction pipe
temperature sensor, see the following graph.
YES
Is the connection
of suction pipe temperature sensor
connector OK?
NO
Temperature-resistance characteristics
Temperature sensor resistance (kΩ)
Temperature (°C)
15
10
5
010304020 50
5kΩ at 25°C
(Broken wire)
(Short-circuit)
Correct connection of
suction pipe temperature
sensor connector.
Defective suction pipe
temperature sensor
➞
Replace.
Defective outdoor unit
control PCB
➞
Replace.
(Defective suction pipe
temperature sensor input
circuit)
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:
Error code
Remote control:
Content
1-time flashKeeps flashing
Keeps flashing
5-time flashKeeps flashing
Indoor display
RUN light TIMER light
Green LED
Yellow LED
Red LED
Outdoor unit
control PCB
Outdoor unit
inverter PCB
Suction pipe temperature
sensor anomaly