honeywell thermostat not working blank screen

All you have to do is get to the. Three wires going into the thermostat.

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The first step will be to see if your thermostat is powered properly.

. I thought it must be the battery so I replaced it. This mainly happens after a power outage. Honeywell Lyric and Smart Round Thermostats Press and hold the cloud icon.

If your system is fine and the thermostat only works on. Put the batteries back in. The screen on my Honeywell RTH8500 Wi-Fi Series hads gone blank.

In order to fix this you will have to remove the thermostat cover. If that fails to power up the thermostat you may need to involve a technician. If the device is common wired try and power it up with batteries.

Honeywell TH8000 unresponsive touch screen. 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. We turned it off schedule recently because the temperatures got cooler and we didnt need the heat pump running.

We cover how the thermostat works the color code what to l. Check breaker to indoor unit. Select the reset button when it appears.

First cutting off power by tripping the circuit breaker Then remove the batteries from your thermostat and inserting them back in reverse position for about 5 seconds. Overheating typically occurs due to poor airflow or parts that are going bad or broken. If the thermostat does not wake up when you approach please replace the AAA Lithium battery.

If you have a wire in the C terminal you should have AC. Burnt out wiring and blown fuses are common if your system was connected to a higher voltage than what it was designed to. It shows date time and inside temp but no other controls or settings are available.

The issue - Answered by a verified HVAC Technician. The first step is to check the batteries. Loose or faulting wiring might be the culprit especially if your thermostat is newly installed.

As mentioned one major reason the Honeywell Thermostat screen goes blank is when the batteries are drained out and can no longer supply power to the screen. 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. However now the thermo touchscreen is unresponsive.

How Do You Reset a Honeywell Thermostat When the Screen Is Blank. Honeywell thermostat blank screen reset Step 1. To rule this out double-check to make sure your furnace door is fully closed.

As the screen of your thermostat is not working you have to forget about the screen first. To tell if your Lyric has AC power gently pull the thermostat away from the wallplate and look at your wiring. You might think that this is a weird process but this works.

Gently pull the thermostat away from the wallplate remove the battery and replace it with a new one. The TH9421C1004 is attached to a control unit. If your thermostat screen goes blank after several minutes of operation it could be due to the high-limit switch tripping.

Honeywell and other brands of programmable thermostats typically show a blank screen when there is. 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. If there are no batteries providing power the Honeywell thermostat will not work or even display anything on the screen.

Your batteries may drain out without noticeespecially if you have been away for too long. 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. 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.

If the door to the furnace is open for instance the thermostat display may be blank. This thermostat is 8 years old and was pro-installed. If screen is blank we have lost power to the thermostat.

If you own a Honeywell thermostat the blank screen could be an indication of a furnace door that wasnt completely closed. These thermostats are programmed to shut off entirely if a furnace door is open. 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.

An Open Furnace Door. Grab the sides and pull gently. What can you do if your Honeywell thermostat is showing a blank screen.

Will be a year in November. To reset the thermostat even when the screen is blank you. Thermostatic Controls - Honeywell TH9421C1004 Blank Screen - Its 9 degrees outside and my heat pump is not working.

The easy diagnosis of this blank screen issue is that the batteries have died. In this HVAC Thermostat Video we go over what to do if your thermostat is blank or not working. If the display of your thermostat is not on or is fading your device might be losing power or not getting power at all.

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. So first make sure that the batteries are working and if not replace them. Unscrew the 2-4 screws that may be securing the base to the wall.

However if that screen goes blank you cant do any of this. I have forced air. My thermostat screen is blank and will not turn on.

Yes the battery should be able to keep the clock settings right but it. This may also occur if you recently wired your system to convert from a battery-powered thermostat to an electrical thermostat. If your Honeywell thermostat is not working and there is no display we recommend you work through the following troubleshooting steps.

The upstairs one is not working and the screen is blank. Most furnaces have a high-limit switch that prevents the system from overheating. If your Honeywell thermostat display light is not working even after this it could be that the circuit breaker has tripped.

After a brief power outage the Honeywell TH9421C1004 thermostat is a blank screen. You should also check the circuit breaker. One of the most common reasons behind no response on your thermostats screen is loose wire on the back of your thermostat.

A fix could be as simple as closing the door of the furnace. Press and hold the down arrow. How can I fix a Honeywell thermostat screen not responding.

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