Your boiler has detected a safety fault and has locked itself out to prevent damage or unsafe operation.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Led alarm (red)
What causes this fault?
This fault occurs when the boiler has overheated or failed to detect a flame during the startup process. The most common reasons are a build-up of excess heat due to a circulation issue or a component failure that prevents the burner from lighting safely.
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 LD1 — no call-out fees, no surprises.
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Vokera Mynute 10E 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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