Your boiler has temporarily paused its heating process because it has detected a sudden rise in temperature and needs time to cool down before restarting.

DIY fix possible

Check that all radiator valves are fully open to allow water to flow.Ensure the boiler pressure gauge is between 1.0 and 1.5 bar; top up if it is too low.Check for any air trapped in the system and bleed your radiators if necessary.