BoilerFaultCodesTechnical description
Sensor S0 is defective.
What causes this fault?
This fault occurs when the boiler's main internal temperature sensor fails to send a consistent electrical signal back to the central control board. The most common reason is that the sensor has suffered a physical failure or the wiring connecting it has become loose or damaged over time. Because the boiler can no longer accurately monitor how hot the water is, 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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