Entering the synchronisation test mode: Enter the clock menu, move to the software version item by several pushesof the PB1S on the control PCB or >> on IR. Keep pushing both buttons on control PCB simultaneously or button DISP onIR until the display shows C0:00 Use the PB2 or + button on IR to set the value behind the colon to 03 Keep pushing simultaneously both clock PCB buttons or the DISP button onIR, until the display shows synchronisation information