BoilerFaultCodesTechnical description
Mounting fault sensor S0
What causes this fault?
This fault occurs when the boiler's control system loses contact with a temperature sensor that should be firmly clipped to the internal pipework. The most common reason is that the metal spring clip holding the sensor has become loose or displaced, often due to natural vibrations or heat expansion over time. Because the boiler can no longer accurately measure how hot the water is getting, it shuts down as a safety precaution to prevent overheating.
Engineer required
This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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