Heat Pump, Split System, Single Service, 3 phase
32 Maintenance Document 1394-1
Clear 9: Outdoor temperature thermistor error
Hydraulic Unit LED:
Green 7 flashes / Red 4 flashes
Outdoor Unit LED: 7 flashes
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) -20 -10 -5 0 5 10 15 20 30 40 50 60 70
Resistance (kΩ) 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
- 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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