BoilerFaultCodesYour boiler has detected a fault with its internal thermometer and has stopped working as a safety precaution.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Boiler temperature sensor shorted out
What causes this fault?
This fault occurs when the boiler's internal temperature sensor, which monitors the warmth of the water, suffers an electrical failure or 'short circuit.' The most common reason is that the sensor has worn out internally over time, though it can also be caused by moisture getting into the electrical plug or a damaged wire.
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 30 — no call-out fees, no surprises.
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Viessmann Vitodens 100 Compact 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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