AUTO UPDATING. Allow 5-10 minutes after changing setting before air conditioner starts. Thermostat Batteries Died and Need to be Replaced. Many require batteries that need to be changed around once every year. We - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. 3. As thermostat keeps getting smarter they need to be updated to its latest version available. Please see below the reasons which may cause the blank display on HR92 TRV after changing the batteries: The batteries are not placed correctly or not secured properly after clipping them with the metal part - the little screws provided with the unit can help to secure the batteries in place. My honeywell thermostat has a blank screen I replaced the batteries, the blower works, but no heat. • The thermostat has a built-in time delay on cooling. Screen not responding and screen freeze happens in some thermostat. Replace the batteries and see if your thermostat turns on. And when it is time to troubleshoot, most of the solutions are simple for the owner to execute. If your Honeywell programmable thermostat flashes "Batt Lo," you simply need to replace the battery. When the batteries are weak, it may cause the screen on a thermostat to go blank and turn on again. The Batteries Are Dead. If you notice and the screen freezes or the screen is not responding in your thermostat, then after some tries the thermostat starts restarting to refresh the system. Chances are, the batteries have died and the thermostat simply can’t power on. 2. Honeywell's programmable thermostats are designed to be easy to use under normal circumstances. If your thermostat screen has gone blank, and your thermostat runs on batteries, the first thing you should try is replacing the batteries with a fresh set. They did not use a spring material in the contacts! The display lets us know what the temperature is in the house. 4 Reasons Your Thermostat Display is NOT Working and How to Fix It 1. I have attempted a factory reset on the thermostat, and I do hear a quiet but definitive "click" when I believe it is attempting to activate the HVAC unit, but that's as far as it gets. If so, take the front panel off of the thermostat and then add new fully charged batteries to replace the old ones. First, you need to determine if this is the situation with your thermostat. Generally, a thermostat can last you 10 to 20 years or even longer, but when the screen goes blank, your furnace shuts off, and the battery nor the fuse or circuit breaker are to blame, it’s possible that your thermostat itself may have finally just died. IF YOU CHANGED THE BATTERIES AND STILL HAVE A BLANK SCREEN, IT IS BECAUSE THE BATTERY CONTACTS ARE NoT CONTACTING THE BATTERY! • If display is blank or says ‘bAt Lo,’ install fresh batteries. 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