Your boiler is struggling to correctly measure the temperature of your hot water, which may lead to lukewarm water or no hot water at all.

Fault on Hot Water Sensor

What causes this fault?

This fault occurs when the boiler's internal computer can no longer read a reliable signal from the sensor responsible for monitoring your tap water temperature. The most common reason is that the sensor has either suffered water damage from a small leak or has simply worn out over years of constant heating and cooling.