3. PILOT LIT, BUT NO MAINS GAS High

Ideal 3. PILOT LIT, BUT NO MAINS GAS Fault Code

Also written as 3PILOTLITBUTNOMAINSGAS — same fault.

The Ideal 3. PILOT LIT, BUT NO MAINS GAS fault code means: your boiler's small pilot light is on, but the main burner is failing to ignite to provide heating or hot water.. 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: Check supply voltage at control box, fuse, CH and HW controls, system controls (room/cylinder thermostats), boiler thermostat, and gas control valve.
Typical repair cost £120-300 (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 3. PILOT LIT, BUT NO MAINS GAS fault code

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

Source

Ideal 3. PILOT LIT, BUT NO MAINS GAS 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