How much does it cost to fix Baxi error code 270?

Typical repair cost for the Baxi 270 fault is £100-£350 including labour.

270 High

Baxi 270 Fault Code

Q: What does the Baxi 270 fault code mean?

Your boiler has detected that it is heating up too quickly without enough water circulating through it, causing it to shut down to prevent overheating.

The Baxi 270 fault code means: your boiler has detected that it is heating up too quickly without enough water circulating through it, causing it to shut down to prevent overheating.. It appears on 26 Baxi models in our database.

Technical description: Dry fire

What causes the Baxi 270 fault?

This fault occurs when the heat exchanger becomes too hot too quickly because there isn't enough water moving through the system to carry the heat away. The most common reasons are a seized internal pump, a blockage caused by sludge buildup, or air trapped within the boiler's internal pipework.

This issue is frequently seen when turning the heating back on for the first time in autumn, as pump components can seize up after being idle throughout the summer.

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

DIY fix possible

Check that your boiler pressure gauge is between 1.0 and 1.5 barIf the pressure is low, top up the system using the filling loopEnsure all radiator valves are open and bleed any trapped air from your radiatorsReset the boiler by turning the selector switch to 'R' for five seconds

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Baxi models that show the 270 fault code

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

Source

Baxi 270 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