BoilerFaultCodesTechnical description
No red lights (Green light functioning)
What causes this fault?
This fault occurs when the boiler's internal brain loses the ability to distribute power to key components like the fan or pump. It is usually caused by a surge that has blown the internal glass fuses or a complete failure of the transformer on the main circuit board. Because the boiler cannot verify that its safety systems are powered, it shuts down entirely as a precaution.
This fault is often seen after summer thunderstorms or during winter power grid fluctuations, as electrical surges are the primary trigger for blowing the boiler's internal fuses.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register →