if no display on unit
the first thing to check is the batteries
if you dont know where the batteries are located try looking in user guide
if you dont have a user guide follow this link
http://www.industry.siemens.co.uk/buildingtechnologies/uk/en/building-automation/residential-controls/documentation/Documents/RDJ10_1.pdf
if after changing batteries display is still blank
you need new unit which will require rebinding to the existing reciever unit
manwithnoname, April 2012
