Display Display\Temperature\State\Alarms. The 4 digit Display visualizes water temperature, the functioning State of the system and eventual alarms: Display Discription Display Discription OFF state Modulation Check up Stand by Ignition Safety Stabilization Extinguishing Recover ignition System off with alarms If there are alarms the Display will show alternatively ALt / ErrorCode: Display Discription Display Discription Manually rearmed SafetyThermostat Accidental Extinguishing contact is open Over Boiler Temperature Probe reading out of range Failed Ignition - Switching on the control board by the General Switch, Product Code and Firmware Version are displayed for 2 seconds.