How much does it cost to fix Atag error code b26?

Typical repair cost for the Atag b26 fault is £100-350 including labour.

b26 High

Atag b26 Fault Code

Q: What does the Atag b26 fault code mean?

Your boiler has stopped working because the water pressure is too low or the pump isn't circulating water through the system.

Also written as B26 — same fault.

The Atag b26 fault code means: your boiler has stopped working because the water pressure is too low or the pump isn't circulating water through the system.. It appears on 1 Atag model in our database.

Technical description: Boiler block: Low water pressure or pump failure

Typical repair cost £100-350 (including labour)

DIY fix possible

Check the pressure gauge on the front of the boilerIf the pressure is below 1.0 bar, use the filling loop to top it up to 1.5 barReset the boiler once the correct pressure is reached

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Atag models that show the b26 fault code

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

E Range Repair: £100-350

Source

Atag b26 fault code information on this page is sourced and cross-checked against the official Atag service / installation manuals for each affected model.

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