Heat Pump, Split System, Single Service, 3 phase
Maintenance Document 1394-1 33
Clear 10: Heat Sink Thermistor (inverter) error
Hydraulic Unit LED:
Green 7 flashes / Red 7 flashes
Outdoor Unit LED: 9 flashes
Probable causes:
• Misconnection.
• Sensor failure.
• Inverter 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) 0 5 10 15 20 30 40 50
Resistance (kΩ) 15,8 12,2 9,5 7,5 5,9 3,78 2,50 1,69
Temperature (°C) 60 70 80 90 100 120
Resistance (kΩ) 1,17 0,83 0,6 0,44 0,33 0,19
- 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 Inverter PCB.
OK
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