Question about Heating & Cooling

1 Answer

Display is blank and furnace fan stays on

My honeywell thermostat shows a blank display and the furnace fan stays on what do i do

Posted by on

Ad

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Contributor
  • 478 Answers

Remove wires at tstat Turn switch for furnace off than on.
touch the red wire to the white to simulate a call for heat.
Or Touhc red green and yellow to simulate a call for cool.
If that works get a new thermostat.

Posted on May 10, 2009

Ad

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

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

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

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

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

I just got a new Honeywell Utility Pro Thermostat. The digital temperature gauge seems very sensitive which results in the unit turning the furnace on and off for very short periods; much shorter than my...


Sounds like you also have a high efficiency furnace like mine.
Here is a procedure to slow down the number of cycles you are experiencing.
1. press System
2. press and hold buttons 3 and 5 on the bottom of the screen. (there should be 7 buttons displayed)
3. set code to 240
4. change setting to 3 for 3 cycles per hour. (your thermostat probably shows a higher number, probably 5? That is why your unit is cycling so often).

Jan 20, 2011 | Honeywell Electronic Programmable...

1 Answer

The display on my honeywell thermostat is blank, what do I do


Hi, Check the batteries and replace as needed or check for power from the air handler/ furnace...

Here is a tip that tells you how to get a manual for most any Honeywell productonline...

Manual Honeywell How to Find Honeywell Manuals

heatman101

Sep 18, 2010 | Honeywell Programmable Thermostat Heater

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

Auto fan does not turn my furnace fan on-I have to use manual on


with the fan in the auto position, the fan only comes on during a demand for heat.  does it not come on during a demand for heat?

Nov 24, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Central honeywell air conditioner


Sounds like it may have lost power. Check the breaker and the fuse at the furnace. If they are all in the on position and working then it sounds like you may need a technician. If the display is blank on the thermostat you may also want to replace the batteries.

Jun 12, 2008 | Honeywell Electronic Programmable...

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

Related Topics:

135 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts

Paul Carew

Level 3 Expert

2600 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 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...