Emergency
Flame On Before Gas On on Ideal Logic+ Combi C

Your boiler has detected heat or a flame signal inside the unit before it has actually turned the gas on, which has caused it to lock itself down for your safety.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

What the manual says

Manufacturer manual

False Flame Lockout

Shared across the Logic COMBI2 range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This is a emergency 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 →

Avoid the next call-out bill

A cover plan would handle faults like Flame On Before Gas On: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

All 27 fault codes on the Logic+ Combi C

Seeing a different code? Every code this model can display, in one place.

Related guides you might find useful