Manual for NCB-150E - Troubleshooting and error codes + PDF Download

Manual for NCB-150E - Troubleshooting and error codes + PDF Download

Brand: NAVIEN

Category: Water Heater

Document Type:

Language: EN

Uploaded: April 8, 2025, 3:49 a.m.

Manual Publish Date: 2015-10-26

Warranty Summary

Navien products come with a limited warranty covering labor, parts, and the heat exchanger, with specific periods depending on the component and application.

Turning the Boiler On or Off: Press the [Power] button to turn the boiler on or off.

Adjusting Space Heating Temperature: Press the Mode button once (space heating icon appears), then use + or - buttons to adjust the temperature.

Adjusting DHW Temperature: Press the Mode button twice (DHW icon appears), then use + or - buttons to adjust the temperature.

Viewing Basic Information: Press the [Mode] button three times to view information such as space heating and DHW temperatures, water flow, and pressure.

Troubleshooting and error codes

Error Code Sub Code Function Self-diagnostic/Action
**E001** 0 Overheating of heat exchanger Clean the Strainer, Check the Pump, Check flow rate, Check heat exchanger
**E003** 0 Ignition failure Check gas supply, Verify gas pressure, Check gas system and orifice
**E004** 0 FALSE flame detection Ensure ground wire, Check igniter spark
**E012** 0 Flame loss Check gas line, Verify gas pressure, Check gas meter, Check flame rod
**E016** 0 Overheating of heat exchanger Clean inlet filter, Check High Limit Switch, Check dipswitch, Check 3 way valve
**E030** 0 Exhaust Overheat Turn OFF system, Clean inlet filter, Check exhaust thermistor
**E046** 2 Abnormal heat exchanger High Limit Switch Check High Limit Switch connection, Check PCB connection
**E047** 1, 2 Abnormal exhaust thermistor Check exhaust thermistor connection, Check PCB connection
**E060** 1, 2, 3 Abnormal Dual Venturi Limit Switch operation Check Dual Venturi connection, Test Dual Venturi, Check gas orifice
**E109** 0 Abnormal fan motor activity Check intake air filter, Verify voltage from PCB, Check fan motor
**E110** 1, 2, 3 Exhaust blockage Check exhaust pipe, Check intake air filter, Restart unit
**E205** 2 Abnormal H/E outlet thermistor Check thermistor, Check Pump operation, Replace thermistor
**E218** 1, 2 Abnormal Heating return thermistor Check thermistor, Check voltage from PCB, Replace thermistor
**E351** 0 Abnormal Auto feeder valve Check auto feeder valve
**E352** 1, 2 Abnormal water pressure (High pressure) Check auto feeder valve, Check water pressure sensor
**E353** 1, 2 Abnormal water pressure sensor Check water pressure sensor
**E407** 1, 2 Hot water outlet thermistor Check thermistor, Check Pump operation, Replace thermistor
**E421** 1, 2 Cold water inlet thermistor Check thermistor, Check voltage from PCB, Replace thermistor
**E439** 3 Abnormal flow sensor Check flow sensor
**E515** 3 Abnormal PCB Manual RESET
**E517** 3 Abnormal DIP Switch setting Manual RESET
**E594** 1 Abnormal communication in parts of PCB Alarm
**E615** 3 Abnormal input & memory Manual RESET
**E740** 2 Abnormal outdoor sensor Auto RESET
**E782** 1 Abnormal Main-Panel communication Auto RESET
**E777** 2 Abnormal LWCO Auto RESET
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