BoilerFaultCodesYour boiler has lost power to its internal electrical control circuit, meaning it cannot communicate with its parts or operate at all.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Short-circuit 24V: Check wiring.
What causes this fault?
This fault occurs when there is an electrical 'short' in the low-voltage circuit that powers the boiler's sensors and internal controls. It is usually caused by water leaking onto electrical components or a damaged wire touching the metal casing, which forces the boiler to shut down to prevent damage to the main circuit board.
This issue is slightly more common during the autumn when heating systems are first turned back on, as pinhole leaks or dampness may have developed around the electrical sensors over the summer months.
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 0 1. — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha W40 60 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.