BoilerFaultCodesChaffoteaux MAIN BURNER DOES NOT LIGHT Fault Code
Also written as MAINBURNERDOESNOTLIGHT — same fault.
The Chaffoteaux MAIN BURNER DOES NOT LIGHT fault code means: your boiler is failing to ignite the main flame, which means you currently have no heating or hot water because the system cannot produce heat safely.. It appears on 3 Chaffoteaux models in our database.
Technical description: I) Gas service tap not open fully; II) Gas pressure low; III) Water rate low; IV) Gas valve not opening; V) Diaphragm punctured; VI) Venturi blocked or loose; VII) Gas control tap faulty; VIII) Wrong injector; IX) Slow ignition device stuck or wrongly adjusted
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 MAIN BURNER DOES NOT LIGHT fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Chaffoteaux MAIN BURNER DOES 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 7 July 2026