Mitsubishi FDT71VH - Discharge Pipe Temperature Sensor Anomaly

-
114
-
'20 • PAC-SM-351
E39
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
Is the
discharge pipe
temperature sensor
connector connected
properly?
YES
Are the
characteristics
of discharge pipe
temperature
sensor
OK?
NO
For the characteristics of discharge pipe
temperature sensor, see the following graph.
YES
0
20
40
60
80
100
120
140
160
180
200
020406080 100 120 140 160
NO
Temperature-resistance characteristics
Temperature sensor resistance (k
Ω
)
Temperature (°C)
(Broken wire)
(Short-circuit)
Correct connector.
Defective discharge pipe
temperature sensor
➞
Replace.
Defective outdoor
unit control (or main)
PCB
➞
Replace.
(Defective discharge pipe
temperature sensor input
circuit)
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the discharge pipe temperature
sensor
3 . Condition of error displayed
When the temperature sensor
detects -10°C or lower for 5
seconds continuously within
10 minutes to 10 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.
4. Presumable cause
• Defective outdoor unit control
(or main) PCB
• Broken sensor harness or
temperature sensing section
(Check molding.)
• 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
Discharge pipe temperature
sensor anomaly