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THIS ACCESSORY MUST BE FITTED BY A COMPETENT. PERSON. FAILURE TO COMPLY COULD LEAD TO. PROSECUTION. LEAVE THESE INSTRUCTIONS WITH THE USER OR AT. THE APPLIANCE. IMPORTANT: To get the best from your Worcester appliance please read these instructions carefully. 7 Day Twin Channel Timeswitch. THESE INSTRUCTIONS ARE APPLICABLE TO. THE WORCESTER BOSCH MODEL(S) STAT- The Digistat Programmer has factory set programs for ON/OFF periods for central FITTING & oPERAnNG INSTRUCTIONS FOR WORCESTER BOSCH. CONTACT &MANUAL. ~WORCESTER. TWIN CHANNEL DT20 PROGRAMMER ~ '". 8-716-106-647 issue b (11.04) UK.To return the programmer to the standard programme and 12.00am MON press the SET and + Worcester Heat Systems Ltd. (Bosch Group), Cotswold Way, Warndon, Refer to your boiler's Installation, Commissioning and Servicing instruction manual for mounting the Programmer into the boiler fascia. Wall mounted Programmer. Greenstar Comfort Twin Channel Programmer Installation and Operating Instructions. If your product was manufactured before 01.07.2014, see below for