• If temperature setting is lower than room temperature and SYSTEM ON arrow is displayed, thermostat is operating correctly. Chances are, the batteries have died and the thermostat simply can’t power on. When the batteries are weak, it may cause the screen on a thermostat to go blank and turn on again. If so, take the front panel off of the thermostat and then add new fully charged batteries to replace the old ones. 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. Many require batteries that need to be changed around once every year. 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. 3. Not all residential thermostats run on the home’s primary power supply. 50018270-001. 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 your thermostat is blank, the first thing you should do is check the batteries. • The thermostat has a built-in time delay on cooling. 8. Our thermostat died yesterday, but after replacing the dead batteries with fresh batteries, and confirming the LCD screen was operable, our AC no longer turns on. The display lets us know what the temperature is in the house. My honeywell thermostat has a blank screen I replaced the batteries, the blower works, but no heat. 4 Reasons Your Thermostat Display is NOT Working and How to Fix It 1. Contact ac contractor. If your Honeywell programmable thermostat flashes "Batt Lo," you simply need to replace the battery. First, you need to determine if this is the situation with your thermostat. 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. Allow 5-10 minutes after changing setting before air conditioner starts. Honeywell's programmable thermostats are designed to be easy to use under normal circumstances. The Batteries Are Dead. Screen not responding and screen freeze happens in some thermostat. We - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. They did not use a spring material in the contacts! Thermostat Batteries Died and Need to be Replaced. And when it is time to troubleshoot, most of the solutions are simple for the owner to execute. IF YOU CHANGED THE BATTERIES AND STILL HAVE A BLANK SCREEN, IT IS BECAUSE THE BATTERY CONTACTS ARE NoT CONTACTING THE BATTERY! The display tells us what the desired settings are including letting us know the setpoint setting the temperature. 2. 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. • If display is blank or says ‘bAt Lo,’ install fresh batteries. AUTO UPDATING. Blank Display on Thermostat Problem - Screen Disappeared - The thermostat display is our interface with our HVAC equipment. Replace the batteries and see if your thermostat turns on. - the thermostat and then add new fully charged batteries to replace the old ones and... 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