BoilerFaultCodesTechnical description
Mounting fault sensor S0
What causes this fault?
This fault occurs when the boiler's main flow sensor is not making proper physical contact with the internal pipework. The most common reason is that the metal retaining clip has vibrated loose or snapped, causing the sensor to drift away from the pipe and lose its temperature reading. Without this accurate data, the boiler shuts down to prevent the system from dangerously 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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