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

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

3. PILOT LIT, BUT NO MAINS GAS High

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

Also written as 3PILOTLITBUTNOMAINSGAS — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code 3. PILOT LIT, BUT NO MAINS GAS appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's small pilot light is on, but the main burner is failing to ignite to provide heating or hot water. (As reported on Ideal WLX RS50 / RS60)

Pick your boiler brand for the 3. PILOT LIT, BUT NO MAINS GAS fix

Ideal 3. PILOT LIT, BUT NO MAINS GAS 2 models

Source

Information for the 3. PILOT LIT, BUT NO MAINS GAS fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

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