How much does it cost to fix Baxi error code E.01.12?

Typical repair cost for the Baxi E.01.12 fault is £90-220 including labour.

E.01.12 High

Baxi E.01.12 Fault Code

Q: What does the Baxi E.01.12 fault code mean?

Your boiler has sensed that the water returning from your radiators is hotter than the water leaving the boiler, which usually means there is a circulation problem or a sensor fault.

Also written as E0112 — same fault.

The Baxi E.01.12 fault code means: your boiler has sensed that the water returning from your radiators is hotter than the water leaving the boiler, which usually means there is a circulation problem or a sensor fault.. It appears on 7 Baxi models in our database.

Technical description: Return sensor temperature greater than flow temperature

Typical repair cost £90-220 (including labour)

DIY fix possible

Ensure all radiator valves (TRVs) are fully openCheck that the boiler pressure is between 1.0 and 1.5 barPress the Reset button for five seconds

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Baxi models that show the E.01.12 fault code

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

Source

Baxi E.01.12 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