BoilerFaultCodesYour boiler has no electrical power, meaning the controls and display are completely dead.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: All power off.
What causes this fault?
This fault occurs when the electrical supply to the boiler's internal brain has been interrupted or a critical component has failed. The most common reason is a blown fuse on the main circuit board or a failure of the internal transformer which converts power for the display. In some cases, it can be caused by an external issue like a tripped circuit breaker or a blown fuse in the wall switch.
DIY fix possible
Check if the boiler's electrical isolation switch is turned on.Inspect your home's main fuse box to see if a circuit breaker has tripped.Check the fuse in the boiler's fused spur switch, usually located on the wall nearby.
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 Display not illuminated — no call-out fees, no surprises.
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Potterton Envoy 30 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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