2 flashes green High

Baxi 2 flashes green Fault Code

Also written as 2FLASHESGREEN — same fault.

The Baxi 2 flashes green fault code means: your boiler has shut down because a safety or external control circuit, such as an energy-saving thermostat or an external sensor, has been disconnected or interrupted.. It appears on 4 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Shutdown input: BL terminals on User Interaction Controller are open circuit
Typical repair cost £80-160 (including labour)

DIY fix possible

Check if your room thermostat or programmer is turned up and calling for heat.Replace the batteries in your wireless room thermostat if applicable.Ensure any external emergency shut-off switches haven't been accidentally turned off.

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Baxi models that show the 2 flashes green fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi 2 flashes green fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026