5 green flashes Low

Baxi 5 green flashes Fault Code

Also written as 5GREENFLASHES — same fault.

The Baxi 5 green flashes fault code means: your boiler has experienced a brief digital hiccup or settings error and is attempting to fix itself automatically.. It appears on 27 Baxi models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Parameter error on printed circuit board (PCB). Temporary error, will self reset

What causes the Baxi 5 green flashes fault?

This fault occurs when the boiler's internal computer experiences a brief communication error or a temporary glitch in its stored settings. It is often caused by a minor power fluctuation or a digital 'hiccup' where the board fails to read its own configuration data for a split second. The boiler usually detects this inconsistency and performs an automatic reboot to clear the error.

Typical repair cost £0-350 (including labour)

DIY fix possible

Wait for the boiler to complete its automatic self-reset processMonitor the display to see if the flashing stops naturallyIf the flashing continues for more than 10 minutes, try turning the boiler off and back on at the fused spur switch

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Baxi models that show the 5 green flashes fault code

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

Source

Baxi 5 green flashes 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 27 April 2026