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-£280 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 27 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 heat exchanger reaches an unsafe temperature, triggering a safety sensor to cut the power. The most common reasons are a pump failure preventing water from moving through the system or a blockage such as lime scale or sludge restricting the flow. Sometimes, the overheat thermostat itself has simply become faulty and is sending a false signal to the control board.

This fault is more common in winter when the heating is first turned on after a long summer break, as circulating pumps can often seize or stick during months of inactivity.

Typical repair cost £100-£280 (including labour)

DIY fix possible

Check that your radiator valves are open and not turned to off or zeroEnsure your system water pressure is between 1 and 1.5 bar on the pressure gaugeTurn the selector switch to the reset position for five seconds and then back to your desired setting

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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 27 April 2026