How much does it cost to fix Baxi error code 27?

Typical repair cost for the Baxi 27 fault is £120-220 including labour.

27 High

Baxi 27 Fault Code

Q: What does the Baxi 27 fault code mean?

Your boiler has lost its ability to measure the temperature of the water being sent to your radiators, so it has shut down as a precaution to prevent overheating.

The Baxi 27 fault code means: your boiler has lost its ability to measure the temperature of the water being sent to your radiators, so it has shut down as a precaution to prevent overheating.. It appears on 6 Baxi models in our database.

Technical description: Fault on Pump or Low System Pressure

Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Baxi models that show the 27 fault code

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

105e Repair: £150-350
Bahama 80e / 105e Repair: £90-160
Combi 130e Repair: £180-350
Combi 80e Repair: £120-220
Combi Elite Repair: £120-220
System Repair: £60-350

Source

Baxi 27 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