Your boiler's temperature sensor for hot water has stopped working correctly, meaning your taps might not get warm or the temperature could be inconsistent.

Fault on Hot Water Sensor

What causes this fault?

This fault occurs when the internal sensor responsible for monitoring your tap water temperature fails to send a reliable signal to the main control board. The most common reason is that the sensor's internal components have degraded over time due to constant heating and cooling cycles, or the electrical connection has become corroded. Because the boiler no longer knows how hot the water is, it stays off as a safety precaution to prevent scalding.