BoilerFaultCodes Valve leakage control: lock out Emergency
Your boiler has detected a potential internal gas leak and has automatically locked itself shut to keep your home safe.
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: Occurs if the membrane pump fails to create an overpressure of 30 mbar within 27 seconds. Requires reset by pressing the reset button on the valve leakage control.
Typical repair cost £150-300 (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.
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A boiler cover plan would cover faults like Valve leakage control: lock out — no call-out fees, no surprises.
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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.
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