Question about Heating & Cooling

1 Answer

My honeywell t8775 thermostat just went blank and now my ac just runs without colling down. Do i need a battery

Posted by on

  • majahsty Jun 29, 2008

    Thanks Chill!

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 104 Answers

This unit does not use a battery. It runs off of power from the furnace. Two possabilities. One is a problem with the low voltage power supply from the furnace. The other is that the thermostat died and needs to be replaced.

Posted on Jun 28, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

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

The display went blank on my honeywell t8600c thermostat. when the batteries were changed, the display shows the time and -AC. Nothing else functions


I believe this thermostat will display -ac if it loses power from the furnace or air handler. Your thermostat will operate on low voltage(same as your door bell) and constantly powers your thermostat. I would check your furnace breaker, and fuses to see if there is power to the equipment

Nov 03, 2013 | Heating & Cooling

1 Answer

Honeywell ac thermostat not working


The replacement batteries may be no good or may have been installed with the wrong polarity. Also, if your Honeywell thermostat latches into a wall mount, you may have reinstalled it incorrectly. I speak from experience

Jun 18, 2013 | Heating & Cooling

1 Answer

I have the T8775 model and the display went blank last night. Now the A/C is not coming on. Any suggestions on what I can do to fix it or what happened to it?


It is possible the batteries are dead in the t-stat.
If batteries are good check the power to the air handler.
If power is good the air handler transformer may be bad.(high voltage in and low voltage out)
If transformer is good check all low voltage thermostat wires especially red and blue.

Aug 02, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

My honeywell ac panel went blank when i turn the heat on and the heat don"t start , the ac works fine


I would check a couple things lets start with the thermostat itself remove from the wall mount and check to see if the red and white wires are attached. Does this thermostat take batteries? If so replace the batteries. If still no heat make a jumper and jump out the red and white wires this should turn your heat on and now means that it is a thermostat problem. Purchase a new one and pay attention to all of the wires and where they go.Good luck

Dec 13, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

The thermostat for the main zone in my house (honeywell model RTH5100B1017) is battery powered and it blinked change the battery for a couple of daye and then went blank. I have changed the batteries twice...


  • Check any batteries and replace if needed. Ensure that you use only AA alkaline, nonrechargeable batteries.
  • 2 Check for oxidation buildup on battery contacts. Use electrical contact cleaner and carefully clean the battery contacts of any oxidation buildup.
  • 3 Reset the system switch.


  • Read more: How to Troubleshoot Honeywell Thermostats ' eHow.com http://www.ehow.com/how_6596826_troubleshoot-honeywell-thermostats.html#ixzz17aWIl2Xt

    Dec 09, 2010 | Heating & Cooling

    1 Answer

    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.

    Jul 18, 2010 | Honeywell Programmable Thermostat Heater

    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

    May 10, 2010 | Honeywell Programmable Thermostat Heater

    3 Answers

    CT3600 display went out. Replaced all 3


    My honeywell CT3600 thermostat went blank.
    Replaced batteries - no change ?

    Dec 25, 2009 | Honeywell CT3600 7 Day Electronic...

    Not finding what you are looking for?
    Heating & Cooling Logo

    Related Topics:

    256 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Heating & Cooling Experts

    paulcarew

    Level 3 Expert

    2401 Answers

    Dan Webster
    Dan Webster

    Level 3 Expert

    8205 Answers

    Donni Steen

    Level 3 Expert

    659 Answers

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

    Answer questions

    Manuals & User Guides

    Loading...