BoilerFaultCodesTechnical description
No gas supply - gas supply to the boiler has not been turned on or purged sufficiently
What causes this fault?
This fault occurs when the boiler attempts to ignite but cannot detect a flame, usually because the gas supply is blocked or has been interrupted. The most common reasons include a closed manual gas cock, air trapped in the pipes after a service, or a gas valve that is physically unable to open. In some cases, the components that generate the spark or detect the heat may have worn out, preventing the boiler from confirming it has safely lit.
This fault is more common during the first cold snap of winter when gas valves that have been idle through the summer become stuck or fail to respond to the sudden demand for heating.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.