How much does it cost to fix Biasi error code E26?

Typical repair cost for the Biasi E26 fault is £120-£350 including labour.

E26 High

Biasi E26 Fault Code

Q: What does the Biasi E26 fault code mean?

Your boiler has detected an internal communication error or a sensor failure, meaning it cannot accurately measure the temperature of the water used for your heating or taps.

The Biasi E26 fault code means: your boiler has detected an internal communication error or a sensor failure, meaning it cannot accurately measure the temperature of the water used for your heating or taps.. It appears on 5 Biasi models in our database.

Technical description: Main electronic p.c.b. / Main circuit temp probe / D.H.W. temp probe

Typical repair cost £120-£350 (including labour)

Engineer required

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

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Biasi models that show the E26 fault code

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

Source

Biasi E26 fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026