BoilerFaultCodesTechnical description
The outside temperature of the sensor connected to the control unit is utilised internally
What causes this fault?
This code is triggered when the boiler's internal computer updates how it processes information from the outdoor weather sensor. It is essentially a background synchronization task where the system re-calibrates the temperature data to ensure your heating runs efficiently. It rarely indicates a physical breakdown and is usually just the software confirming its settings are correct.
DIY fix possible
Check the outdoor sensor is not covered by snow, ice, or debrisMonitor the boiler display to see if the message clears automaticallyRestart the boiler once to see if the advisory code clears
Find a Gas Safe engineer
Search the official register →