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Self-diagnosis function
Error
Error Type
No.
180
Master
1801
Plate type heat exchanger
Slave1
freeze prevention
1802
Slave2
1803
n Error diagnosis and countermeasure flow chart
Is circulation water normal?
Yes
Is DIP switch setting
geothermal mode?
Yes
Are temperature sensor
connector connections
normal?
Yes
Is the value of temperature
sensor resistance normal?*
Yes
Replace outside unit PCB
* Sensor resistance 100 kΩ over (open) or 100 Ω below (short) will generate error
Note: Temperate sensor resistance vary with temperature, So compare temperature sensor resistance value
according to Outdoor unit temperature by referring below table (±5 % tolerance)
Air temperature sensor: 10 °C = 20.7 kΩ : 25 °C = 10 kΩ : 50 °C = 3.4 kΩ
Pipe temperature sensor: 10 °C = 10 kΩ : 25 °C = 5 kΩ : 50 °C = 1.8 kΩ
Error Point
Plate type heat exchanger
freeze prevention
No
Check about the water
circulation system and reset
No
Check and set geothermal mode
No
Check and correct connection
No
Replace sensor
1. Lack of circulation water
2. Inlet water temperaure is low
3. Defective water temperature sensor (Open/Short)
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