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Split system single phase type
Clear 5: Hydraulic Unit Heat exchanger thermistor error
Hydraulic Unit LED: Green 4 flashes / Red 2 flashes
Outdoor Unit LED: flash
Probable causes:
•
Misconnection.
•
Sensor failure.
•
Interface 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
Resistance (kΩ)
176 134 103 80,3 62,9 49,7 39,6 31,7 25,6 20,8 17,1
- If the thermistor is faulty, replace it.
3. Check the electronic board voltage:
- Make sure circuit diagram of hydraulic unit and check terminal voltage at thermistor
(DC5.0V)
Gray
Gray
- If there is no voltage, replace Interface PCB.
12
OK
5
10
15
20
OK
Black
25
30
35
40
45
50
Maintenance Document 1589-3
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