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 is unable to start its small internal flame, meaning the main heating system cannot turn on.. It appears on 1 Ideal 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: Check spark at electrode, HT lead damage, piezo unit operation, air in pipes, gas pressure at boiler inlet, and pilot jet blockage.
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 7 July 2026