BoilerFaultCodesBaxi 3 green flashes Fault Code
Also written as 3GREENFLASHES — same fault.
The Baxi 3 green flashes fault code means: your boiler has briefly lost its flame and is trying to restart itself, which is often a temporary glitch that might resolve without any action.. It appears on 13 Baxi models in our database.
Technical description: Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
What causes the Baxi 3 green flashes fault?
This fault occurs when the boiler's internal sensors detect that the flame has unexpectedly gone out while the unit was supposed to be firing. The most common reasons include a slight instability in the gas supply or a build-up of carbon on the sensor that monitors the flame. Because it is often caused by a fleeting disruption, the boiler will attempt to relight itself automatically before locking out.
DIY fix possible
Monitor the boiler for several minutes to see if it resets automaticallyCheck if other gas appliances in the home are working correctlyPress the reset button if the boiler fails to restart after three attemptsEnsure the condensate pipe has not frozen if the weather is extremely cold
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 3 green flashes: no call-out fees, no surprise bills.
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Baxi models that show the 3 green flashes fault code
Click a model for the full fault code list and model-specific repair notes.
- 100/2 HE Plus Repair: £120-350
- 400 Heat Repair: £100-350
- Bermuda Repair: £80-200
- EcoBlue Plus Combi Repair: £100-250
- EcoBlue System Repair: £100-250
- EP Repair: £100-250
- Netaheat Repair: £100-250
- Performa Repair: £80-250
- Profile Repair: £90-250
- Profile Prima Repair: £80-160
- Statesman Repair: £90-200
- Suprima 100 Repair: £120-350
- Suprima 40 Repair: £100-£350
Source
Baxi 3 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 31 August 2026