Your boiler has detected an electrical issue with its internal heat sensors or the main control board, preventing it from heating your home safely.

Electronic system/sensor fault | Cause: Short circuit in flow or backflow NTC, electronic fault

What causes this fault?

This fault occurs when the boiler's internal computer receives conflicting or impossible signals from its temperature sensors. It usually happens because a sensor has suffered an electrical short circuit or the main control board has developed a hardware malfunction, making it impossible for the system to monitor heat levels safely.