119Operating the Boiler
11.14 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
E001 Heat Exchanger Overheat Check for proper system flow.
E003 Ignition Failure Check gas supply valve and igniter.
E004 False Flame Check electric ground.
E012 Flame Loss Check gas, venting and condensate trap.
E016 Heat Exchanger Overheat Check flow, clean system filters.
E030 Exhaust Overheat Check flow, clean system filters.
E046 Heat Exchanger Thermistor Check thermistor connector.
E047 Exhaust Thermistor Check thermistor connector.
E060 Abnormal Dual Venturi Check dual venturi.
E109 Abnormal Fan Motor Check fan and venting.
E110 Exhaust Blockage Check exhaust venting.
E205 Heating Supply Temp.Sensor Check flow, thermistor connector.
E218 Heating Return Temp.Sensor Check thermistor connector.
E278 Ext. Supply Sensor Not Detected Check sensor connections.
E279 Ext. Return Sensor Not Detected Check sensor connections.
E291 Return Temp. Exceeds Supply Check for reversed piping.
E302 Low Water Pressure Check water pressure.
E352 High Water Pressure Check water pressure.
E353 Water Pressure Sensor Check WPS.
E480 DHW Tank Sensor Not Detected Check sensor connections.
E515 Abnormal PCB Check PCB connections.
E517 Abnormal DIP Switch Check DIP switch settings.
E594 Abnormal EEPROM Check the PCB.
E615 Abnormal Memory Check PCB connections.
E736 Cascade Communication Check cascade cable.
E740 Outdoor Sensor Not Detected Check sensor connections.
E762 Vent Pipe Not Fully Inserted Insert pipe 2-¾“ (70 mm) into exhaust collar.
E777 Low Water Cutoff Activated Check supply water.
E782 Front Panel Communication Check panel connections.
E784 Zone Controller Communication Check wiring and settings.
E786 Improper Front Panel Detected Check for correct panel version.
E788 Incorrect Gas Type Setting Check DIP switch setting.
If any of these remedies do not resolve the problem, contact Technical Support at 1-800-519-8794.
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