1 PILOT WILL NOT LIGHT High

Ideal 1 PILOT WILL NOT LIGHT Fault Code

Also written as 1PILOTWILLNOTLIGHT — same fault.

The Ideal 1 PILOT WILL NOT LIGHT fault code means: your boiler's small starter flame is failing to ignite, which prevents the main heating system from starting up.. It appears on 2 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: Is there a spark at the electrode; Is there gas at the pilot burner when the gas control valve button is pressed; Does the pilot burner light when a match is applied; Check the pilot is correctly set to maximum. Screw adjuster fully CLOCKWISE until closed and then ANTI-CLOCKWISE four full turns.
Typical repair cost £90-180 (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 1 PILOT WILL NOT LIGHT fault code

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

Source

Ideal 1 PILOT WILL NOT LIGHT 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