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Honeywell thermostat the readout (LCD) is blank and A/C is not blowing.

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You have lost power to the A/C system. Check that the Emergency switch has not been turned to the off position by mistake. If it is in the on position you will need to inspect the indoor unit to see if an access panel may have opened slightly causing the door safety switch to open and turn power off to the unit. This is typical found where you replace the air filter. If neither of these help, check the circuit breaker box for a tripped breaker. Cycle the breaker for the A/C system and inspect the thermostat to see if it is displaying any information. If still blank, you may have a bad transformer or something else wrong and a technician will have to diagnose. Hope this is helpful.

Posted on Sep 12, 2007

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Posted on Jan 02, 2017

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Thermostat is not coming on we are in san antonio is there help out there for us


Reasons for a Blank Screen on a Honeywell Thermostat ...

homeguides.sfgate.com > ... > Real Estate Rental & Lease Basics
Honeywell and other brands of programmable thermostats typically show a blank ...and the batteries can no longer provide power to the screen, it will go blank. ...electrical system, a blank screen indicates there is no power going to the unit, ...

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Programmable thermostat started to fail and behave erratically after being in service for a few ... My thermostat works but the remotes have stopped working. .... Honeywell CM907 Digital Programmable Room Thermostat user ...

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Heater fails to turn on it does not mean you have a faulty heating system ... 4th - Check programming on a programmable

Jan 10, 2016 | Honeywell Programmable Thermostat Heater

1 Answer

I have A LCD Honeywell thermostat that has a display that is blank. also it is not sending anything to my furnace. there for my main level in my house is very cold. I have the same one up stairs and it is...


Replace the batteries first. Some cheap thermostats require the batteries to function. I don't know of a honeywell model that does though. Its cheap, so do that first.

If still nothing comes on and you still have a blank display with new batteries, I'd say probably the thermostat is defective. Even if the furnace is broken, new batteries SHOULD bring up the display.

Feb 20, 2015 | Heating & Cooling

1 Answer

Honeywell Chronotherm iv Plus power cuts on and off


There's a trouble shooting guide here, you need to check for the presence of 24V when it goes blank, and trace back to where it's disappearing (I assume it is losing the 24v, if not you'll need to go through the installer setup or read on...
My first thought would be to check the wiring which has been touched last if it started doing that after you had coil replaced.
As an aside I'm not sure which model you have but if it has batteries you should replace them (I don't think it does have batteries but not seen a model iv so I'm unsure)

https://customer.honeywell.com/resources/techlit/TechLitDocuments/69-0000s/69-1410.pdf

May 12, 2014 | Honeywell Programmable Thermostat Heater

1 Answer

My Honeywell programmable thermostat's display is blank and I do not have any heat?


The thermostat, depending on the model, normally does not get powered by batteries, they are for backup power. You might be losing 24 volt from the furnace, causing the thermostat to run on batteries.

Apr 09, 2014 | Honeywell Programmable Thermostat Heater

1 Answer

6AE Lo


6AE Lo is probably 'bAt Lo'. Batteries are low and need to be replaced.  It looks like 6AE Lo because of the digital readout (b looks like 6).

http://www.espenergy.com/faq_honeywell_thermostat.htm

Model number shouldn't change what the readout means.

Oct 14, 2009 | Honeywell CT3600 7 Day Electronic...

1 Answer

Honeywell thermostat t8400c intermittent blank screen


It actually sounds like the batteries are going dead if the 24v from the furnace are not providing the power to the thermostat.

Sep 28, 2009 | Honeywell Electronic Programmable...

1 Answer

I have the same problem.


transformer going bad or bad connection check for 24v ac from red to common batteries only for mem storage and if no common used at stat to hold program red to g fan red to y comp

Jun 09, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Readings disappear on thermostat for awhile then come back


Hi Linda,

There are a few things that cause this:

  1. When the heat is starting, it will sometimes go blank for a few minutes and then resume.
  2. Most have batteries, replace them with fresh new ones, if the electricity goes out while you are away, the batteries will keep the settings.
  3. Have someone check the house when it is extremely cold or hire a service to monitor. Your alarm company can usually add temperature sensors to your home, it will add a little safety net for you.
Hope this was helpful, please rate my answer.
Thanks,
Paul

Jan 27, 2009 | Honeywell Programmable Thermostat Heater

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Honeywell VisionPro TH8110R1008 controlling a Carrier FA4ANF018 electric furnace/AC. Heater won't turn on. Honeywell VisionPro TH8110R1008 controlling a Carrier FA4ANF018 electric furnace/AC. As best I can recollect, the sequence of events went like this: Furnace was working normally. Thermostat was set at 70. Turned temperature on thermostat down to 67 and left the apartment. Didn't notice if furnace was running or not at the time, nor if it was running and shut off when I lowered the temp. Came back an hour later. Furnace was running and temp was up to 72 degrees. Thermostat looked normal. No indication of low batteries. Tried turning the system off on the thermostat. Furnace continued to run. Nothing on the thermostat would affect the furnace. Eventually turned off the circuit breaker (for the apartment electrical, not the breaker on the furnace) to stop furnace. Waited. Turned breaker on. Furnace stayed off. Batteries failed in thermostat and screen went dark with barely readable failing battery message. Put in new batteries. Thermostat fired up but still wouldn't control the furnace. Switched to cooling. AC went on. Couldn't turn AC off. Had to turn breaker off again. Turned breaker on. Thermostat displayed "Wait" message when I tried turning on the furnace. Waited half an hour. Wait message disappeared. Still can't turn furnace on. Slid out lithium backup battery and slid back. Thermostat makes appropriate click sounds as if it is turning the furnace on or off, but furnace doesn't respond. Equipment Status screen shows furnace on or off depending on thermostat settings. Set thermostat to System Off. Checked breaker on side of furnace. Was off. Turned on. Turned temp up on thermostat. Thermostat clicked, but furnace did not go on.

Feb 15, 2020 | Carrier Heating & Cooling

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