BoilerFaultCodesWhat the manual says
Manufacturer manualFAULT: THE BURNER LIGHTS BUT THEN GOES OUT. THERE IS NO FLAME DETECTED.
From this model's manual
Verified against the Glow Worm Ci Range installation & service manual.
What causes this fault?
This fault occurs when the boiler's internal computer cannot verify that a flame has successfully ignited, leading it to shut down the gas supply for safety. The most common reasons are a worn-out flame sensor that can no longer 'see' the fire, a faulty ignition lead, or a blockage in the gas valve preventing the burner from staying lit.
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.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like F1: no call-out fees, no surprise bills.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.