125 R High

Baxi 125 R Fault Code

Also written as 125R — same fault.

The Baxi 125 R fault code means: your boiler has detected that hot water is not circulating properly around your heating system, so it has turned itself off to prevent overheating.. It appears on 2 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Circulation Fault (Primary)
Typical repair cost £150-350 (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 125 R fault code

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

Source

Baxi 125 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