Your boiler is struggling to monitor the temperature of a specific part of your system's pipework, which may cause your heating to run less efficiently or stop working correctly.

What causes this fault?

This fault occurs when the boiler loses communication with the sensor responsible for tracking water temperature in the main mixing chamber of your plumbing. The most common reason is that the sensor itself has failed internally or the wiring connecting it to the boiler's main control board has become loose or damaged. Without this data, the boiler cannot accurately balance the heat output for your home.