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A small  ame icon is lit in the display whenever the 
thermostat is calling for heat. Please note that the boiler 
will only run when both the thermostat and the time 
control are calling
.
Battery replacement
Batteries will last in excess of two years. When batteries 
need to be changed a battery icon will  ash in the display. 
To change the batteries loosen the two screws on the 
base of the thermostat and lift thermostat o  base plate. 
Batteries are located in the rear of the thermostat unit and 
should be replaced using two high quality AA size alkaline 
cells.
Battery replacement