17Troubleshooting
5.2 Understanding Error Codes
When an error code appears on the front panel, refer to the following chart for a definition and possible remedy
for the situation.
Error Code Reason Self-diagnostic / Action
E003 Ignition failure
Ɣ
Ensure that the main gas supply valve is open.
E004 False flame detection
Ɣ
Ensure that the electrical cord is properly grounded.
E012 Flame loss
Ɣ
Clean the intake air filter. See page 14.
Ɣ
Ensure that the electrical cord is properly grounded.
E016 Overheating of heat exchanger
Ɣ
Clean the cold water inlet filter. See page 13.
Ɣ
Flush the heat exchanger. See page 12.
E030
Exhaust overheating (the water heater
shuts down when the flue temperature
exceeds 149 °F (65 °C)
Ɣ
Clean the cold water inlet filter. See page 13.
Ɣ
Flush the heat exchanger. See page 12.
E031 Overheating of burner Contact technical support at 1-800-519-8794.
E046 Abnormal operation: limit control Contact Technical Support at 1-800-519-8794.
E047
Exhaust thermostat: thermistor open
or short circuit
Contact Technical Support at 1-800-519-8794.
E060 Abnormal operation: dual venturi Contact Technical Support at 1-800-519-8794.
E109 Abnormal operation: fan motor Clean the intake air filter. See page 14.
E110 Abnormal air pressure
Ɣ
Ensure that the exhaust pipe is free of obstructions.
Ɣ
Clean the intake air filter. See page 14.
E407
Hot water outlet: thermistor open or
short circuit
Contact Technical Support at 1-800-519-8794.
E421
Cold water inlet1: thermistor open or
short circuit
Contact Technical Support at 1-800-519-8794.
E432
Cold water inlet2: thermistor open or
short circuit
Contact Technical Support at 1-800-519-8794.
E434
Abnormal operation: water adjustment
valve
Contact Technical Support at 1-800-519-8794.
E438
Abnormal operation: circulation pump
(in case of installed AHU)
Check if the circulation pump is operating properly.
E439 Abnormal operation: flow sensor Contact Technical Support at 1-800-519-8794.
E441
Hot water inlet2: thermistor open or
short circuit
Contact Technical Support at 1-800-519-8794.
E445
Abnormal operation: Bypass mixing
valve
Contact Technical Support at 1-800-519-8794.
E515 Abnormal operation: PCB Ensure that the electrical cord is properly grounded.
E517 Abnormal operation: DIP switch setting Contact Technical Support at 1-800-519-8794.
E593 Abnormal operation: front panel key Contact Technical Support at 1-800-519-8794.
E594 Abnormal operation: EEPROM Contact technical support at 1-800-519-8794.
E615
Abnormal operation: input and
memory
Contact Technical Support at 1-800-519-8794.
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