Question about Heating & Cooling

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

1 Answer

Chandler Ede

Level 3:

An expert who has achieved level 3 by getting 1000 points

Superstar:

An expert that got 20 achievements.

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.
Master
1,420 Answers

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

1 Suggested Answer

Anonymous

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Instant Repair Help over the Phone

6ya.com

Save Time & Money by instantly connecting to...

Posted on Jan 02, 2017

Add Your Answer

Upload

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

Loading...

Include an image. It's worth a thousand words.

prev next

Related Questions:

2 Answers

I have 2 RTH230 thermostats. The battery in one of them was low because the little battery icon was blinking. Did not change batteries right away but a few weeks later the entire readout went blank.

At least two free manuals are online, that might suggest how to change the batteries. I could not reach the manufacturer web site, that was reportedly under maintenance, but you might need to contact the manufacturer for assistance if the manuals don't help.

https://www.manualslib.com/manual/69881/Honeywell-Rth230b.html

http://homeappliance.manualsonline.com/manuals/mfg/honeywell/rth230b.html

Honeywell Programmable Electronic Thermostat Installation and User Guide...

Aug 26, 2018 | Thermostats Heating & Cooling

1 Answer

How do I fix my Honeywell RTH 9580WF1013 wifi thermostat that has a blank screen?

The thermostat probably was reinstalled incorrectly.

Oct 14, 2016 | Honeywell RTH8580WF WiFi Thermostat

1 Answer

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, ...

programmable thermostat troubleshoot - YouTube

? 3:35
https://www.youtube.com/watch?v=pNVTAUcBx-U
Sep 26, 2011 - Uploaded by Maxxmentum
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 ...

HEAT WON'T TURN ON How Test if your Thermostat is ...

? 2:36
https://www.youtube.com/watch?v=lSJn69EAcAw
Nov 16, 2014 - Uploaded by You can Fix It!!!!
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:

When the heat is starting, it will sometimes go blank for a few minutes and then resume.
Most have batteries, replace them with fresh new ones, if the electricity goes out while you are away, the batteries will keep the settings.
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

Not finding what you are looking for?

View Most Popular

Heating & Cooling

I have 2 RTH230 thermostats. The battery in one of them was low because the little battery icon was blinking. Did not change batteries right away but a few weeks later the entire readout went blank.

Thermostats Heating & Cooling

Open Questions:

0 Answers

Samsung RS275 refrigerator is at room temperature inside the unit but everything else appears to be working (fans running, compressor is running, just no cooling).

Feb 17, 2020 | Samsung Heating & Cooling

0 Answers

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

0 Answers

My arlec pa1210 portable air con is throwing code "E3". Can hear compressor trying to kick in but cant.

Feb 14, 2020 | Heating & Cooling

0 Answers

Mpi monitor error 07??

Feb 13, 2020 | Heating & Cooling

Ask a Question

Usually answered in minutes!

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

PDF Manual

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

1 Answer

Chandler Ede

1 Suggested Answer

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

I have 2 RTH230 thermostats. The battery in one of them was low because the little battery icon was blinking. Did not change batteries right away but a few weeks later the entire readout went blank.

How do I fix my Honeywell RTH 9580WF1013 wifi thermostat that has a blank screen?

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 ...

programmable thermostat troubleshoot - YouTube

HEAT WON'T TURN ON How Test if your Thermostat is ...

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...

Honeywell Chronotherm iv Plus power cuts on and off

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

6AE Lo

Honeywell thermostat t8400c intermittent blank screen

I have the same problem.

Readings disappear on thermostat for awhile then come back

Not finding what you are looking for?

Heating & Cooling

I have 2 RTH230 thermostats. The battery in one of them was low because the little battery icon was blinking. Did not change batteries right away but a few weeks later the entire readout went blank.

Open Questions:

Samsung RS275 refrigerator is at room temperature inside the unit but everything else appears to be working (fans running, compressor is running, just no cooling).

My arlec pa1210 portable air con is throwing code "E3". Can hear compressor trying to kick in but cant.

Mpi monitor error 07??

Related Topics:

Ask a Question

Top Heating & Cooling Experts

Paul Carew

Marvin

john h

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Manuals & User Guides

5536 Lasco CeramicTowerHeater.pdf....

Lakewood heater model # 5500.pdf....

Hepa Air Handler Filter Purolator.pdf....

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

1 Answer

Chandler Ede

1 Suggested Answer

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

I have 2 RTH230 thermostats. The battery in one of them was low because the little battery icon was blinking. Did not change batteries right away but a few weeks later the entire readout went blank.

How do I fix my Honeywell RTH 9580WF1013 wifi thermostat that has a blank screen?

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 ...

programmable thermostat troubleshoot - YouTube

HEAT WON'T TURN ON How Test if your Thermostat is ...

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...

Honeywell Chronotherm iv Plus power cuts on and off

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

6AE Lo

Honeywell thermostat t8400c intermittent blank screen

I have the same problem.

Readings disappear on thermostat for awhile then come back

Not finding what you are looking for?

Heating & Cooling

I have 2 RTH230 thermostats. The battery in one of them was low because the little battery icon was blinking. Did not change batteries right away but a few weeks later the entire readout went blank.

Open Questions:

Samsung RS275 refrigerator is at room temperature inside the unit but everything else appears to be working (fans running, compressor is running, just no cooling).

My arlec pa1210 portable air con is throwing code "E3". Can hear compressor trying to kick in but cant.

Mpi monitor error 07??

Related Topics:

Ask a Question

Popular Questions

Sunbeam Electric Blanket blinking

Patio heater won't stay lit

Compressor makes noise and goes on and off constantly

F2 Fault Code On Heating Pad

New heating pad not working

Top Heating & Cooling Experts

Paul Carew

Marvin

john h

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Manuals & User Guides

5536 Lasco CeramicTowerHeater.pdf....

Lakewood heater model # 5500.pdf....

Hepa Air Handler Filter Purolator.pdf....