How much does it cost to fix Ideal error code b 26?

Typical repair cost for the Ideal b 26 fault is £80-150 including labour.

b 26 High

Ideal b 26 Fault Code

Q: What does the Ideal b 26 fault code mean?

Your boiler has stopped working because the water pressure inside the system is currently too low to operate safely.

Also written as B26 — same fault.

The Ideal b 26 fault code means: your boiler has stopped working because the water pressure inside the system is currently too low to operate safely.. It appears on 1 Ideal model in our database.

Technical description: Minimum water pressure switch not closed

Typical repair cost £80-150 (including labour)

DIY fix possible

Locate the filling loop (usually a silver braided hose under the boiler).Slowly open the valves on the filling loop to allow water into the system.Monitor the pressure gauge on the front of the boiler until it reaches 1.5 bar, then securely close the valves.

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Ideal models that show the b 26 fault code

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

Imax W Repair: £80-150

Source

Ideal b 26 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

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