Alarm Dhw; Module Inv Alarm - LG THERMA V AHNW16606B0 Service Manual

Displaying the error
Description of error
Response of internal unit
controller
Possible causes
Troubleshooting
Displaying the error
Description of error
Response of internal unit
controller
Possible causes
Troubleshooting
HP did not reach the minimal temperature 3x
After resolving the error, the device restarts normally by pressing the MENU button
• 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.
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.
Lost communication with the external device
The device automatically restarts after the error is resolved
• 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.
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.
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ALARM DHW

MODULE INV ALARM