BoilerFaultCodesTechnical description
Outside sensor fault – try resetting the boiler
What causes this fault?
This fault occurs when the boiler loses its connection to the probe located on the outside of your house designed to monitor weather conditions. The most common reason is that moisture or corrosion has damaged the sensor's internal wiring, or the electrical signal between the sensor and the boiler's main control board has been interrupted.
This issue often comes to light during the first cold snap of autumn when the boiler attempts to use outdoor temperature data to adjust your heating for the winter.
DIY fix possible
Locate the reset button (usually a circular arrow or 'R') on the front control panel.Press and hold the reset button for 2 to 3 seconds.Wait for the boiler to restart; if the code reappears, a professional is required to check the wiring.