Firebird Envirogreen Regular Fault codes & diagnostics

4 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Regular Oil 2019-present
Download the Firebird Envirogreen Regular manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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All 4 documented codes

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Burner Lockout

Your boiler has stopped working for safety reasons and needs a manual reset or a professional to investigate why it failed to light.

High Engineer only £120-250

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Oil nozzle
  • Control box
e1

Your boiler's temperature sensor is providing faulty information, causing the system to stop operating as a safety precaution.

High Engineer only £120-220

Parts commonly replaced

  • NTC Thermistor
  • Wiring harness

Related codes

e2

Your boiler has detected a communication issue with a sensor in its exhaust pipe, so it has safely shut down to prevent potential overheating.

High Engineer only £120-220

Parts commonly replaced

  • Flue gas temperature sensor
  • Wiring harness / Probe loom

Related codes

e5

Your boiler has stopped working because the burner failed to ignite or stay lit, meaning you currently have no heating or hot water.

High Engineer only £150-350

Parts commonly replaced

  • Photocell
  • Ignition electrodes
  • Fuel pump
  • Control box

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