Mitsubishi SRK100VNXWPZSX, Service Manual

Page: 156 / 202

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155
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'20 • PAC-SM-351
E37
1. Applicable model
5. Troubleshooting
All models
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 (k
Ω
)
Temperature (°C)
15
10
5
0 10 30 40 20 50
5k Ω at 25°C
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:
Content
1-time flash Keeps flashing
Keeps flashing
2-time flash
Keeps flashing
Indoor display
RUN light TIMER light
Green LED
Yellow LED
Red LED
Outdoor unit
control PCB
Outdoor unit
inverter PCB
Outdoor heat exchanger
temperature sensor anomaly