LG THERMA V AHBW076A0, Service Manual, Page: 63 / 98

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15 Water pipe overheated
Code
No.
Description Cause Normal Condition
• Abnormal operation of
electric heater
• Leaving water temperature
is above 57 °C
• Possible maximum leaving water tem-
perature is 57 °C.
Start
END
(it is normal
condition)
A
A
B
B
NO
YES
YES
YES
YES
NO
NO
Leaving water
temperature is higher
than target water
temperature
Thermostat is
installed
Leaving water
temperature is higher
than 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.