honeywell thermostat not working blank screen
How to Troubleshoot 1. Next check near the indoor unit for a float switch in drain and if you have one lift it to see if we get power to thermostat.
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So first make sure that the batteries are working and if not replace them.
. Check breaker to indoor unit. Press and hold the down arrow. When you are unable to operate your thermostat follow these instructions to resolve this issue.
After a brief power outage the Honeywell TH9421C1004 thermostat is a blank screen. I have confirmed power in the blower power at the thermostat. I have forced air.
This thermostat is 8 years old and was pro-installed. Yes the battery should be able to keep the clock settings right but it. When a power surge occurs in your home your HVACs circuit breaker may.
Replace the Batteries in Your Thermostat. Next check near the indoor unit for a float switch in drain and if you have one lift it to see if we get power to thermostat. It will flash a low battery signal for one to two months before they run out completely but if youve been away or havent noticed the signal this could be the reason.
The TH9421C1004 is attached to a control unit. The reason for your Honeywell thermostat touch screen not working could be faulty batteries. So the next time you notice that your Honeywell thermostat screen is blank.
If that fails to power up the thermostat you may need to involve a technician. If your Honeywell thermostat display light is not working even after this it could be that the circuit breaker has tripped. Turn on Your HVAC Systems Circuit Breaker.
If the screen of your Honeywell thermostat is blank you should first check the furnace or air conditioner to be sure both are on and functioning properly. Try replacing the batteries and starting your thermostat again. The first step is to check the batteries.
One of the most common issues that is reported by several users is that their Honeywell thermostat screen is not responding. Grab the sides and pull gently. Honeywell Thermostat Blank Screen.
One of the most common reasons behind no response on your thermostats screen is loose wire on the back of your thermostat. This mainly happens after a power outage. If screen is blank we have lost power to the thermostat.
If the display of your thermostat is not on or is fading your device might be losing power or not getting power at all. If your Honeywell thermostat is not working after a battery change ensure the doors are closed because if your HVACs access doors are still open you may still have a blank screen. Same exact situation - thermostat screen was blank a few months after installing a new 240 V baseboard heater wiring and thermostat.
If you have a wire in the C terminal you should have AC. Honeywell TH9421C1004 Blank Screen. The easy diagnosis of this blank screen issue is that the batteries have died.
A fix could be as simple as closing the door of the furnace. Gently pull the thermostat away from the wallplate remove the battery and replace it with a new one. The first step will be to see if your thermostat is powered properly.
What can you do if your Honeywell thermostat is showing a blank screen. If that drain gets partially clogged the float will kill power to so it does not keep making water and ruin ceiling carpet or floor. To tell if your Lyric has AC power gently pull the thermostat away from the wallplate and look at your wiring.
If the device is common wired try and power it up with batteries. We hope that this guide has been helpful. If that drain gets partially clogged the float will kill power to so it does not keep making water and ruin ceiling carpet or floor.
Honeywell TH8000 unresponsive touch screen. It shows date time and inside temp but no other controls or settings are available. This issue may occur in the case of any Honeywell programmable thermostat whether it is a wireless or a wired device.
If screen is blank we have lost power to the thermostat. In order to fix this you will have to remove the thermostat cover. Check breaker to indoor unit.
Its 9 degrees outside and my heat pump is not working. Flat out batteries will cause many issues with your thermostat. If your system is fine and the thermostat only works on.
Blank screen issues with thermostats are usually traced to lowcompletely. My voltage tester showed power coming into both wires at the thermostat. Honeywell Lyric and Smart Round Thermostats Press and hold the cloud icon.
Unscrew the 2-4 screws that may be securing the base to the wall. Your digital Honeywell thermostat may not work properly even if the screen is okay but the time-of-day and day-of-week are incorrectly set. However now the thermo touchscreen is unresponsive.
If the thermostat does not wake up when you approach please replace the AAA Lithium battery. If there are no batteries providing power the Honeywell thermostat will not work or even display anything on the screen. If the door to the furnace is open for instance the thermostat display may be blank.
Three wires going into the thermostat. If your Honeywell thermostat is not working and there is no display we recommend you work through the following troubleshooting steps. Select the reset button when it appears.
We turned it off schedule recently because the temperatures got cooler and we didnt need the heat pump running. If batteries do power up your common wired thermostat check your breakers furnace power switch furnace door kill switch to insure your system is powered. I changed the bad thermostat for a new good one and the new one was blank too when i powered it back on.
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