Your boiler has temporarily stopped because it cannot circulate water efficiently, likely due to low pressure or an obstruction preventing heat from moving around the system.

DIY fix possible

Check the system pressure gauge on the front panel and ensure it reads between 1.0 and 1.5 barIf low, use the external filling loop to top up the pressureBleed all radiators to release any trapped air that could be impeding water flowEnsure all radiator valves are fully open