How much does it cost to fix Baxi error code 2 red flashes?

Typical repair cost for the Baxi 2 red flashes fault is £100-£350 including labour.

2 red flashes High

Baxi 2 red flashes Fault Code

Q: What does the Baxi 2 red flashes fault code mean?

Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.

Also written as 2REDFLASHES — same fault.

The Baxi 2 red flashes fault code means: your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.. It appears on 22 Baxi models in our database.

Technical description: Boiler overheat tripped

What causes the Baxi 2 red flashes fault?

This fault occurs when the water inside the boiler exceeds a safe temperature limit, triggering a safety sensor to cut the power. The most common reasons are a pump failure preventing water from circulating or a blockage caused by sludge and debris inside the central heating pipework. In some cases, it can be caused by air trapped in the system or a faulty sensor providing an incorrect reading.

This issue often surfaces during the first cold spell of autumn when the heating is turned on after being dormant all summer, which can cause internal pumps to seize.

Typical repair cost £100-£350 (including labour)

DIY fix possible

Check that your radiator valves are open and not turned to zero.Ensure your system water pressure is between 1 and 1.5 bar on the gauge.Turn the selector switch to the reset position for five seconds and then back to 'onn'.

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Baxi models that show the 2 red flashes fault code

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

Source

Baxi 2 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