Fujitsu WATERSTAGE WOYG160LJL Maintenance Document page 15

Clear 8: Heat-exchange thermistor (outlet) error :
Hydraulic Unit LED:
Outdoor Unit LED:
Probable causes:
• Misconnection.
• Sensor fault.
• Main PCB failure.
Check:
1. Check the sensor connection:
-
See if the connector has been disconnected.
-
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 resistancer value
Temperature (°C)
Resistance (k )
- 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)
THERMISTOR
(COMPRESSOR)
THERMISTOR
(OUTDOOR)
THERMISTOR
(PIPE)
THERMISTOR
(DISCHARGE)
THERMISTOR
(HEAT SINK)
THERMISTOR
(PIPE MID)
THERMISTOR
(EXPANSION)
- If there is no voltage, replace Main PCB.
Waterstage / Maintenance Manual / 2105 - EN
Green 7 fl ashes / Red 3 fl ashes
4 fl ashes
OK
-10 -5 0 10
27,5 20,9 16,1 12,4 9,73 7,67 6,1 3,95
OK
15 20 25 30
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