BoilerFaultCodesYour boiler has likely been left in a testing mode during a service, or it is struggling to control the temperature of your hot water properly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Gas valve mode switch not set to 'NORM' or hot water regulation failure.
What causes this fault?
This fault usually happens if the boiler was accidentally left in a special diagnostic mode after a service, which prevents it from operating normally. It can also occur if the boiler's internal computer loses control over the hot water temperature, often due to a faulty sensor or a sticking gas valve. Essentially, the system has detected that it cannot safely regulate the heat and has shut down to protect itself.
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 L — 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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