| ♥ 0 | The display is completely blank. The backlight is on but nothing is showing and nothing comes up when I press the buttons Marked as spam  Posted by (Questions: 180, Answers: 246) Asked on September 5, 2020 6:22 am 244 views Hi one of my c16 thermostats is blank I have put the unit into other stations and it works fine I have tested the electrical current in all units all good wiring checked and again all good the system is less than 13 months old Add comment |