Question about Honeywell Programmable Thermostat Heater

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Help! I'm cold. Thermostat went blank. Going to

Help! I'm cold. Thermostat went blank. Going to try replacing the thermostat. Does the brand or style matter? Right now, going for the lest expensive.

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Just determine what kind of system you have and make sure the new stat will work. (did u try batteries in the old stat? Is the power on to the furnace?

Posted on Oct 01, 2009

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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, ...

programmable thermostat troubleshoot - YouTube

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Jan 10, 2016 | Honeywell Programmable Thermostat Heater

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Home air condition thermostat is blank. My home's central air condition stopped working. So the first thing I did was check the thermostat and it was blank. I then went down to the basement and got the...


Put new batteries in the thermostat. Make sure that the switch that power the furnace is in the "on" position. Sometimes people mistake that switch for a light switch and turn it off.

May 23, 2014 | Heating & Cooling

1 Answer

Set temperature, it goes past it, then it keeps going down until it shuts off


You can test the element by bypassing the thermostat. The element should come on and stay on, probably glowing cherry red. If it will continue to do that for an hour, then you know the element is good.

The problem sounds like a classic thermostat problem. It will come on from cold and up to temperature, but as it drops, the thermostat doesn't click back in because it is stuck open. Its sensitivity is gone, but when it goes cold, the temperature change is big enough to close the circuit.

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Honeywell thermostat went blank


Hello, the thermostat will go blank if there is no power being sent to it, this could be due to a burned out transformer, or a blocked condensate drain which has a safety switch attached to it. You can use a shop vac to clean the line by attaching the hose to the end of the 3/4 inch pvc pipe. If that does not help a new transformer will most likely be needed

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Honeywell digital thermostat went blank, ac unit wont come on, its an 8400c, no breakers tripped


This thermostat has batteries. Try replacing the batteries. You may have to reprogram and make sure it is on.

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1 Answer

Carrier a/c thermostat was working fine, then display went blank!


if it has no batt I would ck transformer for 24to26 volts no voltage replece transformer be sure trans has 115 volts to it trans should be in furnace section

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1 Answer

The thermostat worked correctly for months then


Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need

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Our Robert Shaw thermostat 9520 just went blank. Do you have any ideas, nothing is working?


Try replacing the batteries.

Remove the cover by using a coin or screwdriver to prise it off. Insert the coin at the left side between the backing plate and the the cover, and twist.

Romove old batteries and insert new ones.

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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...

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