BoilerFaultCodes 6.4.4 Valve leakage control - optional Emergency
Your boiler has detected that the internal gas valve may not be closing properly, so it has safely shut itself down to prevent a potential gas buildup.
Act immediately
Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now — this fault can be dangerous if ignored.
Technical description: Lock out
Typical repair cost £200-400 (including labour)
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
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