BoilerFaultCodesYour boiler is currently trying to light the flame to start your central heating.
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: Ignition sequence (heating operation)
What causes this fault?
This is a normal part of the boiler's operation and occurs every time the system detects a demand for warmth in your radiators. It indicates that the internal fans are spinning and the gas valve is opening to create the spark needed for a flame. You will only see this code during the few seconds it takes for the boiler to successfully ignite.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
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 S.3 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.