Your boiler has detected an electrical fault with one of its temperature sensors, meaning it cannot accurately read the heat levels and will stop working to keep you safe.

Short circuit on inlet sensor

What causes this fault?

This fault occurs when the electrical sensor responsible for measuring the temperature of water entering your boiler fails or suffers a short circuit. The most common reason is that the sensor's internal components have worn out over time, leading to an incorrect electrical signal that prevents the boiler from firing safely.