Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 37
Clear 14:
Expansion valve thermistor error
Hydraulic Unit LED:
Green 7 flashes / Red 8 flashes
Outdoor Unit LED:
6 flashes
Probable causes:
• Misconnection.
• Sensor failure.
• Main PCB failure.
Check:
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) 0 5 10 15 20 30 40 50
Resistance (kΩ) 168 130 101 79 63 40 26,3 17,8
Temperature (°C) 60 70 80 90 100 120
Resistance (kΩ) 12,3 8,7 6,3 4,6 3,4 2
- If the thermistor is faulty, replace it.
OK
3. Check the electronic board voltage:
- Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
- If there is no voltage, replace Main PCB.
OK
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