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

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Chandler Ede

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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

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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

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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

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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

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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

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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.

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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...

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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

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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

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

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Chandler Ede

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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.

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

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I have the same problem.

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

1 Answer

Chandler Ede

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.

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:

Model CZFP5 2-Door "Stove Style" Electric Heater. Why no simulated flames? Lights up but no flames flicker

Monitor 2400 heater. What does E13 code indicate?

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