LG THERMA V AHNW16606B0, Руководство по обслуживанию, Страница: 39 / 81

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Displaying the error ALARM DHW
Description of error HP did not reach the minimal temperature 3x
Response of internal unit
controller
After resolving the error, the device restarts normally by pressing the MENU button
Possible causes
• Too low water flow through the heat exchanger in the DHW,
• The heat exchanger in the DHW is too small,
• The temperature sensor in the DHW is not positioned correctly.
Troubleshooting
Too low water flow through the heat exchanger in the DHW:
• The flow in the circulation pump responsible for heating DHW must be appropriately
reset or the operation of the circulation pump must be checked.
The heat exchanger in the DHW is too small:
• Error in the design of the heating system or choice of DHW for hot sanitary water.
The temperature sensor in the boiler is located too low:
• Because of water layering and constant influx of cold water into the DHW, this position
is inappropriate. The sensors have to be placed higher, the recommended position is
somewhere in the middle of the DHW.
Displaying the error MODULE INV ALARM
Description of error Lost communication with the external device
Response of internal unit
controller
The device automatically restarts after the error is resolved
Possible causes
• The external or the internal unit is disconnected,
• The communication cable between external and internal unit is damaged,
• The process module on the internal unit (Display module) is damaged,
• The Module PI485 (modbus converter) on the external unit is damaged.
Troubleshooting
The external or the internal unit is disconnected:
• Check whether the external or internal unit are properly powered or turned on.
The communication cable between external and internal unit is damaged:
• Check whether the connecting cable is suitable, otherwise, replace it.
The process module on the internal unit (Display module) is damaged:
• In case it is not functioning, it needs to be replaced.
The Module PI485 (modbus converter) on the external unit is damaged:
• In case it is not functioning, it needs to be replaced.