LG THERMA V AHNW16606B0, Service Manual, Page: 34 / 81

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Displaying the error ERROR **NO WATER
Description of error There was no flow 3X in a row at compressor start-up
Response of internal unit
controller
After resolving the error, the device restarts normally by pressing the MENU button
Possible causes
• Not enough water in the heating system,
• Circulation pump turned off or malfunctioning,
• Damaged flow switch,
• Bad water quality or dirt.
Troubleshooting
First possible error:
• Check whether the system is properly filled with water. The pressure on the manometer
of the internal unit must be 1.5 ~ 2.0 bar.
• In case the pressure in system is still falling despite adding water, there is a chance of
leakage. Check whether the water part of the system is tight.
Second possible error:
• Check the operation of the circulation pump - whether it is turned on and functioning. In
case it is not functioning, it needs to be replaced.
Third possible error:
• Despite the fact that there is enough water in the system and that it flows flawlessly or
that there is enough flow, the flow switch indicates an error. The flow switch is in the
incorrect position (normally opened - normally closed) or it is mechanically defective
and has to be replaced.
Fourth possible error:
• Bad water quality or dirt. Check the water quality, if it contains possible particles or dirt
which could lead to blockage of the circulation pump.
Displaying the error -Defrost T.Flow ALARM-
Description of error Low outlet temperature during defrosting
Response of internal unit
controller
After resolving the error, the device restarts normally by pressing the
button (MENU).
Possible causes • The outlet temperature during defrosting is too low.
Troubleshooting The minimal temperature of the supply line (outlet water temperature) during
defrosting is 20°C.
• The error can occur when the heating system is cold and the device cannot get
enough heat needed for defrosting from the heating system. The heating sys-
tem needs to be sufficiently heated (the use of the flow electric heater integrat-
ed into the internal unit is possible).