BoilerFaultCodesYour boiler is simply going through its starting sequence and checking its systems before beginning to work.
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: Please wait, initialisation in progress.
What causes this fault?
This is not actually a fault, but the boiler’s internal computer performing a self-check and priming its components. It occurs when the power has been switched off and back on, or after a manual reset, to ensure all sensors and pumps are working correctly before ignition. Once the sequence is complete, your boiler will transition to its normal operating mode automatically.
This display is more common after a winter power cut or when homeowners restart their heating system for the first time in autumn.
DIY fix possible
Wait for approximately 5 minutes for the sequence to finishCheck that the condensate pipe is not frozen if it is winterEnsure the system pressure is between 1 and 1.5 bar
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 P1, P2, P3, P1... — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Worcester Bosch Greenstar 12i System 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.