When you notice that the temperature in your home is not as comfortable as always, your first reaction usually is to go to your thermostat and adjust the temperature. But this time, you’ve discovered your Honeywell thermostat’s display screen is blank, and you feel you’ve lost control over your HVAC system. You want to fix the problem as soon as possible, but you don’t know whether you’ll be able to troubleshoot and fix the problem yourself. Fixing your Honeywell’s blank thermostat screen is easy to do yourself, and rectifying the issues can be as easy as replacing the batteries, reconnecting a loose wire, or adjusting the screen’s brightness.   In this article, I’ll look at possible causes of a blank Honeywell thermostat display screen, indicate how you can diagnose the issues, and provide general tips on how to fix them.  Step 1: Check whether the display screen is really not…