Heat Pump, Split System, Single Service, 3 phase
Clear 7: Discharge thermistor error
Hydraulic Unit LED: Green 7 flashes / Red 1 flash
Outdoor Unit LED: 2 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)
Resistance (kΩ)
168 130 101
Temperature (°C)
Resistance (kΩ)
12,3 8,7
- 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)
- If there is no voltage, replace Main PCB.
30
OK
0
5
10
15
79
60
70
80
90
6,3
4,6
OK
20
30
40
50
63
40
26,3 17,8
100 120
3,4
2
Maintenance Document 1394-1