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Honeywell T8000C Thermostat -- getting E3 code. What does that mean?

I have a Honeywell T8000C programmable thermostat. Had a furnace and air duct cleaning. Ever since, I'm getting an E3 code. What is this? Also, ever since, on occasion, I push the up/down arrows and the display doesn't change, like it's stuck. I have to turn the heat off then back on to get the arrows working. .?.??

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: GDS80904BNA Goodman furnace only cylces off for a minute

Sounds like your repair man ripped you off. He should have stood behind his work.
1. I would try to clean the flame sensor located just below the burners. It is connected to "one" wire (Not the two wire) clean rod with sandpaper.
2. The old and thermostat could have a had a bad heat anticipator. if the new t/stat is not digital the heat anticpator on the T/stat needs to be adjusted. slide the small adjuster arm under the cover to about .6 or .7 and see if the solves the problem. if the t/stat is digital it should be preset from the factory.
3. last resort have a service man check your pressure swith. could be a slow inducer motor, blocked or bad vacum line, or a restricted drain or flue pipe.
Good luck!

Posted on Mar 08, 2009

  • 5 Answers

SOURCE: Honeywell CT3611 thermostat, not working..

if you cross the two wires and you see a slight spark and heat comes on, then the problem is in the thermostat, if not then problem is at furnace it self.

Posted on Apr 26, 2009

  • 5 Answers

SOURCE: Replacing Round Honewell Mercury Thermostat

try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

Posted on Apr 26, 2009

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SOURCE: I have an old Honeywell thermostat (Chronotherm

you are not geting AC power from the furnace

Posted on Sep 27, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: Furnace does not turn on normally

Having to reset it tells me that there is probably an error code blinking on the control board. Look for a small viewing port that looks into the cabinet. Count the number of blinks then remove the panels to find the wiring diagram pasted on one of them. On the diagram you will find a diagnostic code to help you narrow down the problem. It could be as simple as a plugged air filter.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Feb 09, 2010

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