BoilerFaultCodesYour boiler is unable to safely control the flow of gas needed to stay lit, so it has shut down to avoid a potential hazard.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: The diagnostics will indicate which gas valve (1 or 2) or solenoid of the double solenoid is at fault
What causes this fault?
This fault occurs when the boiler's internal computer detects that the gas valve is failing to open or close correctly during the ignition process. The most common reasons are a mechanical failure within the valve assembly, a burnt-out electrical coil, or a loose connection in the wiring harness that prevents the valve from receiving power.
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 Gas valve(s) — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Ideal Concord CXA 40-120 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.