BoilerFaultCodesYour boiler thinks a flame is present even when it hasn't been lit yet, which is causing it to shut down for safety.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: False flame
What causes this fault?
This fault occurs when the boiler's internal sensors detect a flame at a time when there shouldn't be one, such as before the gas has even been turned on. The most common reason is a faulty sensing electrode that is sending a wrong signal to the control board, or moisture causing a short circuit in the electrical components.
This issue can be more frequent during periods of high humidity or after heavy rain, as moisture ingress into the casing can interfere with the sensitive flame detection electronics.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 0 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Systemiser SE is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
Affiliate links — we may earn a commission at no extra cost to you.