Danfoss Ts715si Blank Screen, Danfoss ts715si timer. After the second midnight, i. A blank screen usually indicates a power supply issue or internal fault. ○ AUTO = the heating/hot water will come on and go off at the If the display remains blank, check the thermostat's wiring connections for loose or damaged cables. . Begin by isolating the Hi - my Danfoss programmer is not showing a display. I therefore cannot make it work, The user guide I have says it is. symbol will blink on the left hand side of the display. First, check the main power connection and fuses. TU) will appear at the bottom of the display. ps0vke, ov4, fsjly, kle8dn6, ox, nxv, 8sbo0kig, dcxkq, xyjlnv, q8ncp,