LG Therma V AHBW Series Service Manual page 63

Code
Description
No.
15 Water pipe overheated
Start
NO
Leaving water
temperature is higher
than target water
YES
temperature
YES
Thermostat is NO
installed
YES
NO
Leaving water
temperature is higher
than 57 °C
YES
Cause
• Abnormal operation of
electric heater
• Leaving water temperature
is above 57 °C
END
(it is normal
condition)
A
A
B
B
- 63 -
• Possible maximum leaving water tem-
perature is 57 °C.
• This is unexpected case.
• Turn off the system and call service center.
• If the system is not turned off before it yields
error code (CH15), very hot leaving water will
be generated and it is harmful to human.
• Room air is not fully heated by under floor
heating.
• Wait while room air is heated by target
temperature of thermostat.
Normal Condition