Use and Care Manual

53
The following screen will display when the appliance encounters an error.
▪ J. ERROR MODE
Code Error Code Description Possible Remedies
Er11 Ignition Failure
• Make sure that the main gas supply valve is open.
• Make sure that the gas supply and inlet gas is within speci-
cation.
Er12 Flame Loss
• Clean the intake air lter.
• Make sure that the main gas supply valve is fully open or
have a professional check the gas supply pressure.
Er16
Overheating Heating SupplyThermistor during
DHWOperation(Exceed 205°F(96°C))
• Turn off the Combi Boiler for at least 30 minutes, and then
restarts it.
• Clean the heating return lter.
• Check the circulation pump operation or speed setting as
speed.
• Flush the heat exchanger.
Er20 High Limit Switch Abnormality
• Turn off the Combi Coiler for at least 30 minutes, and then
restart it.
• Clean the heating return lter.
• Check the circulation pump speed setting as speed Ⅲ.
• Flush the primary heat exchanger.
Er29 Air Pressure Switch Abnormality
• Make sure that the exhaust pipe is free of obstructions.
• Clean the intake air lter.
• Make sure that the condensate trap or drain pipe is not
clogged.
Er30
Outdoor Temperature SensorOpen or Short
Circuit
• Check outdoor temperature sensor. Ensure connections are
secure.
• Check sensor resistance. If resistance is zero, replace the
sensor.
• Contact technical support.
Er31
DHW Cold Water ThermistorOpen or Short
Circuit
• Ensure connections are secure.
• Check sensor resistance. If resistance is zero, replace the
sensor.
Er32 DHW Thermistor Open or Short
Er33 Heating Supply Thermistor Open or Short Circuit
Er34 Heating Return Thermistor Open or Short Circuit
Er35 Exhaust Thermistor Open or ShortCircuit
Er38
Abnormal Operation; Memory Error on the
Circuit Board
• Try to reset rst → Still the same Error Code → Contact
Technical Support.
Er39 False Flame Detection
• Clean the ame window.
• Make sure that the front cover is closed securely.
• Check the ame sensor.
Er40 Gas Leakage
• Turn off the gas.
• Contact technical support.
Er41 Fan Speed Error
• To reset this error code, the power needs to be disconnected
and then reconnected.
Er43 Burner Limit Switch Abnormality • Contact technical support.
Er45 Water Leakage
• Close the water inlet valve before contacting technical sup-
port.
• Contact technical support.
Er54 Low Heating Water Pressure
• Water pressure lower than [Setting Pressure - 4] psi
• Check the auto feeder.
• Check the auto feeder inlet pressure.
• Check the pressure sensor.
Figure 37 – Error Mode Screen