Your boiler has detected an internal electrical fault with the gas valve, which means it cannot safely light the flame to provide heating or hot water.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Gas valve control defective
What causes this fault?
This fault occurs when the boiler's main control board loses electrical communication with the gas valve or detects an incorrect voltage return. The most common reason is an internal electronic failure within the gas valve itself or a fault on the circuit board that prevents it from sending the correct signal to release gas.
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 F.60 — no call-out fees, no surprises.
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Vaillant Turbomax Plus 824/828E 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.
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