How much does it cost to fix Baxi error code E131?

Typical repair cost for the Baxi E131 fault is £150-£450 including labour.

E131 High

Baxi E131 Fault Code

Q: What does the Baxi E131 fault code mean?

Your boiler has shut down because it detected that the exhaust gases have become too hot, which is a safety feature to prevent damage to the internal components.

The Baxi E131 fault code means: your boiler has shut down because it detected that the exhaust gases have become too hot, which is a safety feature to prevent damage to the internal components.. It appears on 24 Baxi models in our database.

Technical description: Flue overheat lockout error

What causes the Baxi E131 fault?

This fault occurs when the internal temperature sensors detect that the exhaust gases leaving your boiler have reached a dangerously high level. The most common reasons are a significant buildup of debris or limescale inside the heat exchanger, or damaged internal insulation panels that are no longer protecting the components from the burner's intense heat.

Typical repair cost £150-£450 (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 E131 fault code

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

Source

Baxi E131 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