How much does it cost to fix Baxi error code 3 red flashes?

Typical repair cost for the Baxi 3 red flashes fault is £120-280 including labour.

3 red flashes High

Baxi 3 red flashes Fault Code

Q: What does the Baxi 3 red flashes fault code mean?

Your boiler has tried to light itself several times but cannot establish a flame, meaning you will have no heating or hot water until it is reset or repaired.

Also written as 3REDFLASHES — same fault.

The Baxi 3 red flashes fault code means: your boiler has tried to light itself several times but cannot establish a flame, meaning you will have no heating or hot water until it is reset or repaired.. It appears on 22 Baxi models in our database.

Technical description: Ignition fault. Boiler has attempted to light 5 times and failed.

What causes the Baxi 3 red flashes fault?

This fault occurs when the boiler cannot successfully create or detect a flame after several attempts. The most common reasons include a lack of gas reaching the unit, a worn-out ignition spark, or a sensor that can no longer confirm the flame is safely lit.

This fault is more common in winter, as frozen condensate pipes can back up and prevent the boiler from igniting properly.

Typical repair cost £120-280 (including labour)

DIY fix possible

Check if other gas appliances in your home, like a hob, are working to ensure gas is reaching the propertyCheck that your gas meter has credit if you use a pre-payment systemPress and hold the reset button for five seconds to see if the boiler restarts

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Baxi models that show the 3 red flashes fault code

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

Source

Baxi 3 red 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 7 July 2026