I tried to install Lutron Honywell TouchPro Thermostat LR-HWLV-HVAC and couldn't get the display to turn on. I have the battery installed too. The battery is good and I can measure 3V DC voltage from the CR2032 battery. I have all 5 wires (red, green, yellow, white and blue) connected. Blue is connected to "C" (Common). R and Rc is connected by a jumper.
The original thermostat only uses 4 wires (red, green, yellow, while) and the R and Rc is connected using a jumper.
From the wall I have 2 extra wires (blue and purple). There is about 22v AC voltage when I measure voltage between red and blue. I assume blue is the common in this case, right?
What is the easiest way to check whether the thermostat is defective or not?