5. My Trane XL824 Smart Thermostat screen is blank. Display will not come on: Loss of 24VAC between R & B at the thermo- stat. Thermostat Batteries Died and Need to be Replaced. 1) Check wiring between R & B to see if R & D or B & D have been reversed. Alert Code is present. 4. Thermostat Troubleshooting – Blank Display Screen. It was working fine until today. 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. Replace the batteries and see if your thermostat turns on. 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. Some thermostats, particularly Honeywell thermostats, will go blank if the furnace door isn’t completely closed. Contractor's Assistant: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat? 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. Thermostat displays an alert code on the screen. Some thermostats will also auto-dim the screen at certain times of the day or when there is too much light around it. Contractor's Assistant: Do you plan on doing the work yourself? View and Download Trane Nexia TCONT624AS42DA user manual online. the units are not quite a year old. 2) Check transformer for 24VAC output. Reasons That Your Thermostat Screen Has Gone Blank. Are you considering the Trane XL824 Thermostat? The thermostat is a crucial part of your home’s HVAC system: you can’t control your air conditioning and heating without it! Found this in the Trane XL824 manual: ... Trane XL824 Nexia Control. Instructions on how to reboot Trane 824, 850 and 1050 Thermostats. Furnace Door is Open. 4 Reasons Your Thermostat Display is NOT Working and How to Fix It 1. If your thermostat is blank, the first thing you should do is check the batteries. The thermostat is an essential part of your home’s HVAC system. Mochadaisy. Read these advantages to understand why this thermostat is an excellent choice! I recently acquired a Trane XL824 touch screen thermostat about 5 months ago. On the thermostat? If the display on your thermostat is blank, try these few steps to see if that resolves the problem. Touchscreen Comfort Control. 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 10-18-2014, 04:45 PM #5. 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