How much does it cost to fix Baxi error code 109 R?

Typical repair cost for the Baxi 109 R fault is £150-300 including labour.

109 R High

Baxi 109 R Fault Code

Q: What does the Baxi 109 R fault code mean?

Your boiler is struggling to pump water around your heating system effectively, so it has shut down to protect itself from overheating.

Also written as 109R — same fault.

The Baxi 109 R fault code means: your boiler is struggling to pump water around your heating system effectively, so it has shut down to protect itself from overheating.. It appears on 2 Baxi models in our database.

Technical description: Possible Circulation Fault

Typical repair cost £150-300 (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 109 R fault code

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

Source

Baxi 109 R 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