This code is simply an information display showing the current signal from your wall thermostat, letting you know if your heating is correctly receiving a request to turn on or off.

DIY fix possible

Check your wall thermostat to see if it is set to a higher temperature than the current room temperatureEnsure your programmer or digital timer is set to the 'On' position for heatingIf the boiler is not firing when expected, change the batteries in your wireless thermostat if applicable