26 High

Warmworld 26 Fault Code

The Warmworld 26 fault code means: your boiler has detected an internal configuration error where it is unable to correctly identify its own heat output settings, causing the system to stop working.. It appears on 1 Warmworld model 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: kW 26
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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Warmworld models that show the 26 fault code

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

Source

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

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026