Fujitsu Waterstage Comfort Series Maintenance Document page 17

Split system single phase type
Clear 14: Expansion valve thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 8 flashes
Outdoor Unit LED: flash
Probable causes:
• Misconnection
• Sensor failure
• Main PCB failure
Check:
Clear 14:
1 Check the sensor connection:
- See if the connector has been removed
See if the connection is correct
-
Check for any damage on the sensor cable
-
After solving the misconnection problem, switch the heat pump back on
2 Remove the sensor and check its resistance value :
- Check the resistance value
Temperature (°C)
Resistance (kΩ) 168 130 101
Temperature (°C)
Resistance (kΩ) 12,3 8,7
- If the thermistor is faulty, replace it
3 Check the electronic board voltage:
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5 0V)
WOYA060LFCA
WO*A060LFCA
EXP VALVE
PIPE
DISCHARGE PIPE
OUTDOOR TEMP
- If there is no voltage, replace Main PCB
Maintenance document "1792 - EN"
OK
0 5 10 15 20
79 63
60 70 80 90 100 120
6,3 4,6 3,4
OK
WOYA080LFCA
WO*A080LFCA
COMPRESSOR
TEMP
30 40 50
40 26,3 17,8
2
COMPRESSOR
TEMP
EXP VALVE
OUTDOOR
TEMP
DISCHARGE
PIPE
PIPE
WOYA100LFTA
WO*A100LFTA
EXP VALVE
COMPRESSOR
TEMP
OUTDOOR
TEMP
PIPE
DISCHARGE
PIPE
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