Tag: navien

All the articles with the tag "navien".

• Navien E038 Error Code - Causes & Fix

  30 May, 2026

  E038 means the flow sensor isn't spinning. Open and close the pressure relief valve to free debris, or replace the sensor if stuck.

• Navien E029 Error Code - Causes & Fix

  30 May, 2026

  E029 means air pressure sensor abnormality. Most common fix: check wiring, clear vent blockages, or replace the air pressure sensor.

• Navien E021 Error Code - Causes & Fix

  30 May, 2026

  E021 means the cold water inlet thermistor has an open circuit. Most common fix: replace the failed sensor or repair its wiring.

• Navien E027 Error Code - Causes & Fix

  30 May, 2026

  E027 means abnormal air pressure sensor activity. Most often caused by blocked venting or a dirty air filter. Check airflow first.

• Navien E016 Error Code - Causes & Fix

  30 May, 2026

  E016 means heat exchanger overheat protection. Most common fix: clean the inlet filter and check for scale buildup in the exchanger.

• Navien Tankless E013 Error Code - Causes & Fix

  30 May, 2026

  E013 on Navien tankless means abnormal pump operation. Most common fix: check pump wiring and connectors, then replace the pump if faulty.

• Navien E011 Error Code - Causes & Fix

  30 May, 2026

  E011 on Navien tankless means high water pressure or a faulty pressure sensor. Most often fixed by replacing the water pressure sensor.

• Navien E010 Error Code - Causes & Fix

  30 May, 2026

  E010 signals abnormal air pressure or airflow fault in the combustion system. Clean the air filter and check vents for blockages first.

• Navien E008 Error Code - Causes & Fix

  30 May, 2026

  E008 means the outlet thermistor circuit is shorted. The most common fix is replacing the outlet temperature sensor or its wiring.

• Navien E007 Error Code - Causes & Fix

  30 May, 2026

  E007 means the hot water outlet thermistor circuit is open. Most likely fix: replace the outlet temperature sensor or repair its wiring.

• Navien E006 Error Code - Causes & Fix

  30 May, 2026

  E006 means the heating supply outlet thermistor is shorted. Most units need a new thermistor after checking wiring and connectors.

• Navien E005 Error Code - Causes & Fix

  30 May, 2026

  E005 means the flow sensor isn't spinning properly. Most likely fix: clear debris from the sensor or replace the flow sensor assembly.

• Navien E004 Error Code - Causes & Fix

  30 May, 2026

  E004 means false flame detection. Check for vent blockages and clean the flame rod first-most common fix for this safety lockout.

• Navien E002 Error Code - Causes & Fix

  30 May, 2026

  E002 means low water pressure or insufficient supply to your Navien tankless heater. Check that the inlet valve is fully open first.

• Navien E001 Error Code - Causes & Fix

  30 May, 2026

  E001 on Navien tankless heaters usually signals a flame detection or ignition fault. Clean the flame rod and check gas supply first.

• Navien E109 Error - Causes & Fix

  30 May, 2026

  E109 signals a fan or air-intake fault in your Navien tankless water heater. Most often fixed by cleaning the air filter or fan area.

• Navien E003 Error - Ignition Failure Causes & Fix

  30 May, 2026

  E003 means your Navien tankless heater can't ignite the burner. Most often caused by low gas pressure, closed gas valve, or bad igniter.

• Navien E012 Error Code - Causes & Fix

  30 May, 2026

  E012 means flame loss during operation. Most common fix: check gas pressure and clean or replace the flame rod sensor assembly.

• Navien NPE/NCB Code E003 — Ignition Failure Fix

  21 May, 2026

  E003 on a Navien NPE-A, NPE-S, NCB, or NFC series condensing combi/boiler indicates an ignition failure — the control attempted ignition through its full...

• Navien NPE-A 016 — Overheat Lockout Fix

  21 May, 2026

  Code 016 (also displayed as E016) on a Navien NPE-A or NPE-S tankless water heater means the unit's heat exchanger outlet temperature exceeded the overheat...

• Navien NFC Combi Boiler Error Codes: Complete Guide

  Updated: 1 May, 2026

  Navien NFC combi boiler error codes and fault diagnostics. E-series error codes, causes, and technician-level troubleshooting procedures.

• Navien Error Code E021 — Cold Water Inlet Thermistor Fault Fix

  26 Apr, 2026

  Navien error code E021 means the cold water inlet thermistor has an open circuit. Learn how to diagnose and replace the NTC sensor on NPE, NPN, and NCB series units.

• Navien Error Code E022 — Hot Water Outlet Thermistor Fault Fix

  26 Apr, 2026

  Navien E022 error code means the hot water outlet thermistor is shorted or open. Learn how to diagnose the NTC sensor and wiring on Navien NPE, NPN, and NCB models.

• Navien NCB Combi Boiler Error Codes — Complete Fault Guide

  22 Apr, 2026

  Complete guide to Navien NCB combi boiler error codes, what each fault means, and step-by-step troubleshooting for heating and hot water failures.