BoilerFaultCodesYour boiler's main control board has detected a setup error, meaning it no longer recognises which specific model it is meant to be.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Incorrect SFC
What causes this fault?
This fault occurs when the boiler's main control board loses its identity and can no longer confirm the specific power output it should be producing. The most common reason is a hardware communication failure between the central circuit board and the small 'identity plug' that stores the unit's settings. In many cases, this is triggered by an electrical surge or a component failing due to age.
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 76 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch Greenstar Utility 18/25 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.