How much does it cost to fix Baxi error code High Pressure Fault?

Typical repair cost for the Baxi High Pressure Fault fault is £100-250 including labour.

High Pressure Fault High

Baxi High Pressure Fault Fault Code

Q: What does the Baxi High Pressure Fault fault code mean?

Your boiler has too much water inside, which has triggered a safety valve to release the extra pressure to prevent damage.

Also written as HIGHPRESSUREFAULT — same fault.

The Baxi High Pressure Fault fault code means: your boiler has too much water inside, which has triggered a safety valve to release the extra pressure to prevent damage.. It appears on 1 Baxi model in our database.

Technical description: A pressure of 3 bar or greater indicates a fault. The safety pressure relief valve will operate.

Typical repair cost £100-250 (including labour)

DIY fix possible

Check that the filling loop taps are fully closed and not leakingBleed water from a radiator using a bleed key to reduce the system pressureMonitor the pressure gauge to ensure it stays between 1 and 1.5 barIf pressure continues to rise on its own, call a Gas Safe engineer

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Baxi models that show the High Pressure Fault fault code

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

Bahama 80e / 105e Repair: £100-250

Source

Baxi High Pressure Fault 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