BoilerFaultCodesYour boiler has completely lost power and its display screen is blank, meaning it cannot operate or heat your home.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: No power at control board
What causes this fault?
This fault occurs when the boiler's electrical circuit is broken, preventing power from reaching the internal computer. The most common reasons are a tripped fuse in your home's consumer unit, a blown fuse inside the boiler itself, or a total failure of the main printed circuit board. Essentially, the boiler is unable to 'wake up' because its electrical supply has been cut off.
This issue is slightly more frequent during winter due to power surges caused by stormy weather or increased electrical demand putting pressure on aging components.
DIY fix possible
Check if other appliances are working to rule out a general power cutCheck your home's main consumer unit (fuse box) to see if a circuit has trippedCheck the fused spur switch next to the boiler is turned on and the fuse inside hasn't blown
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 Off / Off — no call-out fees, no surprises.
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Worcester Bosch Greenstar 24i Junior 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.
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