BoilerFaultCodesTechnical description
Component test phase
What causes this fault?
This code appears when the boiler is performing a routine internal test of its own components to ensure everything is working correctly. It is a temporary operational state rather than a mechanical failure, often occurring after the power has been cycled or during a scheduled system check. There is no damage to the unit; it is simply the computer verifying safety protocols before it begins heating again.
DIY fix possible
Wait for the boiler to complete its automatic test sequence.Do not turn the power off while this code is displayed.If the code persists for more than 30 minutes, press the reset button once.
Find a Gas Safe engineer
Search the official register →