BoilerFaultCodesYour boiler has suffered an electrical failure that has caused it to lose power and stop providing heating and hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Blown fuse F2, transformer resistance over 100 ohms, or control board failure.
What causes this fault?
This fault occurs when a component on the boiler's internal circuit board fails or short-circuits, cutting off the main power supply to the unit. The most common reason is an electrical surge or moisture ingress that causes the fuse to blow or the transformer to burn out. Effectively, the boiler has lost its 'brain' and cannot safely manage the electrical components needed to fire up.
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 FAIL POINT B — no call-out fees, no surprises.
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Worcester Bosch 25si and 28si 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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