11 High

Ideal 11 Fault Code

The Ideal 11 fault code means: your boiler has detected that the internal fan system is not starting or stopping correctly, preventing it from safely clearing exhaust gases.. It appears on 3 Ideal models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Air pressure switch made.
Typical repair cost £120-250 (including labour)

Engineer required

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

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Ideal models that show the 11 fault code

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

Source

Ideal 11 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 7 July 2026