BoilerFaultCodesYour boiler is receiving electrical power, but if the light is off, there may be a problem with the electricity supply or the internal circuit board.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Indicates if the mains power is illuminated/available inside the appliance.
What causes this fault?
This issue occurs when the electrical current fails to reach the boiler's control system, either due to a tripped switch in your home's fuse box or a blown fuse inside the appliance itself. It is often caused by a sudden power surge or a failing internal component that has caused the circuit to break for safety.
This fault is more frequent during storm season, as lightning strikes or local power grid fluctuations are more likely to blow the boiler's internal fuses.
DIY fix possible
Check that the boiler's power switch is turned onCheck your home’s main fuse box for a tripped circuit breakerEnsure the fused spur switch near the boiler is turned on
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 Orange 'Mains' light — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm Swift Flow 100 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.
Affiliate links — we may earn a commission at no extra cost to you.