BoilerFaultCodesYour boiler is currently going through its normal starting process but is taking a little longer than usual to fully ignite.
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: Boiler indicates start-up sequence
What causes this fault?
This code appears when the boiler is attempting to light the flame but the internal sensors haven't confirmed a successful ignition within the standard timeframe. It is often caused by a weak spark from a worn ignition electrode or a delay in the gas reaching the burner. While the boiler is trying to correct itself, it indicates that the ignition components are likely deteriorating or need cleaning.
This issue is more frequent during the first cold snap of autumn when a boiler that has been idle over summer is suddenly forced to work harder.
DIY fix possible
Wait 15 minutes to see if the code clears automaticallyCheck that your gas supply is active and turned onReset the boiler by pressing and holding the reset button for 5 seconds
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 P2 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch Greenstar 25HE 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.