Mitsubishi FDT71VH - Page 113

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112
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'20 • PAC-SM-351
E37
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
Is the
outdoor heat
exchanger temperature
sensor connector
connected
properly?
YES
Are the
characteristics of
outdoor heat exchanger
temperature
sensor
OK?
NO
For the characteristics of outdoor heat exchanger
temperature sensor, see the following graph.
YES
Temperature-resistance characteristics
Temperature sensor resistance (kΩ)
Temperature (°C)
15
10
5
010304020 50
NO
(Broken wire)
(Short-circuit)
Correct connector.
Defective outdoor heat
exchanger temperature
sensor
➞
Replace.
Defective outdoor unit
control PCB
➞
Replace.
(Defective outdoor heat
exchanger temperature
sensor input circuit)
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the outdoor heat exchanger
temperature sensor
3 . Condition of error displayed
• When the temperature sensor
detects -50°C or lower for 5
seconds continuously within 2
minutes to 2 minutes 20 seconds
after the compressor ON, the
compressor stops. After 3-minute
delay, the compressor starts again
automatically, but if this anomalous
temperature is detected 3 times
within 40 minutes.
• When -50°C or lower is detected for 5
seconds continuously within 20 seconds
after compressor ON.
4. Presumable cause
• Defective outdoor unit control
PCB
• Broken sensor harness or
temperature sensing section
• Disconnected wire connection
(connector)
Note:
Error code
Remote control:
LED Green Red
Outdoor control PCB
Outdoor inverter
PCB
1-time flash Keeps flashing
Indoor control PCB
Stays OFFKeeps flashing
Content
Keeps flashing
Yellow LED
Outdoor heat
exchanger temperature
sensor anomaly