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Code
Description
No.
20
Electric Heater Overheated
Start
NO
Leaving water
temperature is higher
than target water
YES
temperature
YES
Thermostat is
installed
YES
NO
Leaving water
temperature is higher
than 80 °C
YES
• Abnormal operation of
electric heater
• Leaving water temperature
is above 80 °C
END
(it is normal
condition)
NO
A
B
Cause
• If there is no problem in electric heater
control, possible maximum leaving
water temperature is 80 °C.
• This is unexpected case.
• Turn off the system and call service center.
A
• If the system is not turned off before it yields
error code (CH20), very hot leaving water will
be generated and it is harmful to human.
• If Error Code (CH20) is occurred, please
check thermostat, electric heater, power
supply and others. Also, it is recommended
to check air vent which is located on the top
of the electric heater tank.
• Room air is not fully heated by under floor
heating.
B
• Wait while room air is heated by target
temperature of thermostat.
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Normal Condition
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Troubleshooting
