Your boiler is currently set to summer mode, which means it will provide hot water but has been told not to turn on the central heating.

DIY fix possible

Locate the central heating control knob (the one with the radiator symbol) on the boiler's front panel.Turn the knob clockwise away from the 'off' or sun icon position to your desired temperature setting.Ensure your room thermostat or external heating controls are also calling for heat.