BoilerFaultCodesWhat the manual says
Manufacturer manualMain burner fails to light, pilot burning - Blocked main burner injector.
What causes this fault?
This fault occurs when debris or soot builds up inside the tiny hole of the main burner injector, physically blocking the gas from reaching the burner. While the pilot light stays lit to prove there is a flame, the blockage prevents the main fire from starting, meaning the boiler cannot produce heat for your radiators or water. The most common reason is a buildup of carbon or microscopic dust particles over several years of operation.
This issue often comes to light during the first cold spell of autumn, as the burner is required to run for longer periods and at higher capacities after being mostly dormant over the summer.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Avoid the next call-out bill
A cover plan would handle faults like C.(5): no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Related fault codes
All 17 fault codes on the Kingfisher 2 RS60, RS80, RS100
Seeing a different code? Every code this model can display, in one place.