Fujitsu WATERSTAGE WOYG160LJL Maintenance Document page 16

Clear 9: Outdoor temperature thermistor error
Hydraulic Unit LED:
Outdoor Unit LED:
Probable causes:
• Misconnection.
• Sensor failure.
• 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 resistance 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.
- 16 -
Green 7 fl ashes / Red 4 fl ashes
7 fl ashes
OK
-20 -10 -5 0
115 62,3 46,6 35,2 26,9 20,7 16,1 12,6 7,97 5,18 3,45 2,36 1,65
OK
5 10 15 20 30
Waterstage / Maintenance Manual / 2105 - EN
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