BoilerFaultCodesYour boiler has detected a problem with how gas flows into the unit, meaning it has shut down for safety to prevent a gas-related issue.
Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now — this fault can be dangerous if ignored.
Technical description: Gas safety valve failure
What causes this fault?
This fault occurs when the boiler's control board sends a signal to open the gas valve, but it doesn't receive the correct electrical feedback to confirm it has happened. The most common reason is an internal mechanical failure of the gas valve itself, or a communication breakdown caused by a faulty circuit board or loose wiring connections.
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 16 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Glow-worm 30ci Plus 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.