BoilerFaultCodesYour boiler is working correctly, but it has been a year since its last official check-up and it is now requesting its annual safety service.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: The boiler has been installed for more than 1 year.
What causes this fault?
This message is triggered by an internal timer within the boiler's control board that tracks the time elapsed since the last professional inspection. It is not caused by a mechanical failure, but rather by the system reaching its programmed 12-month milestone for modern safety and efficiency checks. Once the service is completed by an engineer, the timer is reset to clear the notification for another year.
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 SERVICE DUE — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.