Mitsubishi Heavy Industries FDT200VSAWPVH Service Manual page 117

Error code
Indoor control PCB
Remote control: E55
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
When anoumalous low
temperature (resistance) is
detected by the compressor
under-dome temperature sensor
3. Condition of error displayed
If the temperature sensor detcts
-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 under-dome
temperature sensor connection
• Defective under-dome
temperature sensor
• Defective outdoor unit control
PCB
Note:
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keep flashing
5. Troubleshooting
connection of
under-dome temperature
sensor connector
characteristics of
under-dome temperature
sensor OK?
Temperature-resistance characteristics
(Broken wire)
15
10
5
(Short-circuit)
Red
Content
Stays OFF
Compressor under-dome
1-time flash
temperature sensor anomaly
Diagnosis
Is the
OK?
YES
For the characteristics of under-dome
temperature sensor, see the following
graph.
Are the
YES
5k at 25°C
0 10 20 30 40 50
Temperature (°C)
116
- -
'21 • PAC-SM-383
Countermeasure
Correct connection of
NO
under-dome temperature
sensor connector.
Defective under-dome
NO
temperature sensor
➞Replace.
Replace outdoor unit
control PCB.
(Defective under-dome
temperature sensor input
circuit)