How much does it cost to fix Ideal error code 3. PILOT LIT, BUT NO MAINS GAS?

Typical repair cost for the Ideal 3. PILOT LIT, BUT NO MAINS GAS fault is £120-300 including labour.

3. PILOT LIT, BUT NO MAINS GAS High

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

Q: What does the Ideal 3. PILOT LIT, BUT NO MAINS GAS fault code mean?

Your boiler's small pilot light is on, but the main burner is failing to ignite to provide heating or hot water.

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.

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 27 April 2026