1st open the draws on the wireless room stat and replace the 4 AA battery's but do not close the draws,then take it to within 1meter of the receiver,turn the mains off then on again, press button 1 hold it and press button 2 until the red light flashes(learn mode)now first close the right hand draw then the left hand draw of the wireless stat and the display should come on press plus/minus and it should start working,if not both the receiver and stat will need replacing,good luck
jim, February 2009