Mitsubishi FDT71VH - Page 125

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124
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'20 • PAC-SM-351
E53
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
YES
NO
Are the
characteristics of suction pipe
temperature sensor OK?
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)
For the characteristics of suction pipe
temperature sensor, see the following graph.
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:
LED Green Red
Outdoor control PCB
Outdoor inverter
PCB
1-time flashKeeps flashing
Indoor control PCB
Stays OFFKeeps flashing
Content
Keeps flashing
Yellow LED
Suction pipe
temperature sensor anomaly