Machine Fault Guide

Directory

Commercial Boiler

Commercial Boiler fault-code records grouped by brand and product, with source links and safe-use boundaries.

This category currently contains 34 published or scheduled source-linked records across 34 brands. Use the category to narrow the equipment type, then confirm the brand, product family, exact model and controller on the detail record.

Brand coverage

BrandRecords
Navien34

Product scope represented

  • Condensing Boiler

Before using a code meaning

  • A matching number is not enough when a different brand or controller uses the same characters.
  • Read the public source and check that it covers the machine label.
  • Follow only owner-safe actions supported by the exact manual.
  • Escalate repeated alarms, uncertain operating status and hazardous-system work.

Read the source policy and safety framework for the site-wide rules.

Navien E001: Heat exchanger over temperature 0 published records Navien E003: Ignition failure 0 published records Navien E004: False flame detection 0 published records Navien E012: Flame loss 0 published records Navien E016: Heat exchanger overheat 0 published records Navien E030: Abnormal operation: exhaust temperature 0 published records Navien E031: Burner overheating 0 published records Navien E046: Abnormal operation: heat exchanger overheating sensor 0 published records Navien E047: Abnormal operation: exhaust thermostat 0 published records Navien E060: Abnormal operation: dual venturi 0 published records Navien E109: Abnormal operation: fan motor 0 published records Navien E110: Exhaust vent closed 0 published records Navien E127: Abnormal operation: APS 0 published records Navien E205: Abnormal operation: heating supply thermistor 0 published records Navien E218: Abnormal operation: heating return thermistor 0 published records Navien E278: Abnormal operation: system supply thermistor 0 published records Navien E279: Abnormal operation: system return thermistor 0 published records Navien E291: Supply/Return inversion limit 0 published records Navien E302: Low water pressure 0 published records Navien E352: High water pressure 0 published records Navien E353: Abnormal operation: water pressure sensor 0 published records Navien E480: Abnormal operation: DHW tank temperature sensor 0 published records Navien E515: Abnormal operation: PCB component 0 published records Navien E517: Abnormal operation: DIP switch setting (PCB) 0 published records Navien E594: Abnormal operation: EEPROM (PCB) 0 published records Navien E615: Abnormal operation: MCU 0 published records Navien E736: Abnormal operation: Cascade communication 0 published records Navien E740: Abnormal operation: outdoor temperature sensor 0 published records Navien E765: Abnormal external-pump 0 published records Navien E774: Manual reset limit 0 published records Navien E775: Auto reset limit 0 published records Navien E777: Abnormal operation: LWCO limit (external device) 0 published records Navien E782: Abnormal operation: boiler communication 0 published records Navien E784: Abnormal operation: zone controller communication 0 published records