Your boiler has detected a problem with the sensor that monitors the water temperature returning from your radiators, preventing the system from operating correctly.

Central heating return sensor error – possibly damaged

What causes this fault?

This fault occurs when the boiler's control system receives an incorrect or missing signal from the sensor that monitors water returning from your radiators. The most common reason is that the internal components of the sensor have degraded over time or the electrical connection between the sensor and the main control board has become loose or damaged.