Touchscreen Comfort Control. 2) Check transformer for 24VAC output. Chances are, the batteries have died and the thermostat simply can’t power on. Thermostat displays an alert code on the screen. Thermostat Troubleshooting – Blank Display Screen. Specific to the thermostat. So if you go to your digital thermostat one day to turn on the AC or change its programming only to discover that the display screen showing a total blank, you’ll have a problem on your hands. Mochadaisy. Display will not come on: Loss of 24VAC between R & B at the thermo- stat. Ensure that your furnace door is closed securely and see if that fixes the problem. If your thermostat is blank, the first thing you should do is check the batteries. This Trane touch-screen smart thermostat connects you with your home even when you're away. If the display on your thermostat is blank, try these few steps to see if that resolves the problem. The thermostat is an essential part of your home’s HVAC system. Check the Alert icons in the diagnostic screen. Without it, you have no way to change the temperature in the house or even turn your air conditioning and heating system on and off. 4 Reasons Your Thermostat Display is NOT Working and How to Fix It 1. Some thermostats, particularly Honeywell thermostats, will go blank if the furnace door isn’t completely closed. 4. Replace the batteries and see if your thermostat turns on. Instructions on how to reboot Trane 824, 850 and 1050 Thermostats. I recently acquired a Trane XL824 touch screen thermostat about 5 months ago. 1) Check wiring between R & B to see if R & D or B & D have been reversed. Read these advantages to understand why this thermostat is an excellent choice! Nexia TCONT624AS42DA thermostat pdf manual download. Furnace Door is Open. Contractor's Assistant: Do you plan on doing the work yourself? Reasons That Your Thermostat Screen Has Gone Blank. Check the circuit breaker and reset if necessary; Check to make sure the power switch at the heating & cooling system is on; Make sure the furnace door is securely closed The Trane XL624 Z-Wave Thermostat is an innovative programmable, touch-screen smart thermostat control that is compatible with any brand of standard central heating and air conditioning systems. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? the units are not quite a year old. 5. Are you considering the Trane XL824 Thermostat? On the thermostat? 10-18-2014, 04:45 PM #5. The thermostat is a crucial part of your home’s HVAC system: you can’t control your air conditioning and heating without it! Alert Code is present. My Trane XL824 Smart Thermostat screen is blank. Found this in the Trane XL824 manual: ... 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