BoilerFaultCodesYour boiler has lost power to its main control system due to an electrical fault, meaning it cannot start the heating or hot water process.
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
What causes this fault?
This fault occurs when the boiler's internal electrical system detects a short circuit, which shuts down the power to protect the sensitive components. It is often caused by a leak inside the casing that has dripped onto the wiring or a failed component, such as the pump, pulling too much voltage. Without a stable 24V supply, the control board cannot communicate with the parts needed to ignite the burner.
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 1 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Systemiser SE 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.