Pilot will not light High

Chaffoteaux Pilot will not light Fault Code

Also written as PILOTWILLNOTLIGHT — same fault.

The Chaffoteaux Pilot will not light fault code means: your boiler is failing to ignite because it cannot receive or properly process the gas needed to create a flame.. It appears on 3 Chaffoteaux 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: Gas supply not turned on. Gas supply pipes not purged of air. Fusible Link open circuited. Fusible Link shorting to earth.
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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Chaffoteaux models that show the Pilot will not light fault code

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

Source

Chaffoteaux Pilot will not light fault code information on this page is sourced and cross-checked against the official Chaffoteaux service / installation manuals for each affected model.

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