BoilerFaultCodesTechnical description
Time delay adjustable from 10s to 995s; 1 step = 5s
What causes this fault?
This code appears when the boiler detects that the water in the system is reaching the desired temperature too quickly, which usually happens if the radiators cannot dissipate heat fast enough. To protect the burner from wearing out due to constant starting and stopping, the system imposes a calculated waiting period. It is often caused by several radiators being turned off or the pump speed not being synchronised with the boiler's high power output.
This is more common in spring and autumn when the weather is mild and the house doesn't require the boiler's full heating capacity.
DIY fix possible
Check if the display returns to normal operation after 15 minutesEnsure your thermostat is set to a temperature that requires heatMonitor the boiler to see if the code reappears frequently, which may indicate a settings adjustment is needed