Firebird Envirogreen Fault codes & diagnostics

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

Oil 12-73 kW 2024-present
Download the Firebird Envirogreen manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Just want the most common Firebird Envirogreen faults?
The top 6 problems in plain English — with causes, DIY checks and repair costs.
Fault codes

All 3 documented codes

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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

Full explanation for E1
E5

Your oil boiler has safely shut down because the burner has failed to ignite properly.

High Engineer only £100-£250

Parts commonly replaced

  • Photocell
  • Oil nozzle
  • Ignition electrodes
  • Control box

Related codes

Full explanation for E5
L2

Your boiler has stopped running because it has locked itself out, usually because it can't draw enough oil or light the flame.

High DIY-safe £120-280

What to check first

  1. Check that you have enough oil in your storage tank
  2. Ensure the oil supply valve is fully open
  3. Press the illuminated reset button on the burner once

Parts commonly replaced

  • Oil nozzle
  • Photocell
  • Fuel pump
  • Oil filter
Full explanation for L2
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