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Thermostat display has an image of a flame

The unit is in the basement is humming.  We did shut the unit off and turned it back on the humming and flame reaapearred in 15 minutes or so. There is also a smell coming from the vents.

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Sounds like the circulating fan on your furnace is not running. This will cause the furnace to shut down due to overheating, and you can smell the overheating as well. You will probably have to press a reset button on the burner to clear the overheat shutdown. Check the fan belt if there is one. If no belt you have an integral motor. Remove all power from the system and make sure the fan spins freely. If it doesn't, try to work some oil into the bearings. These things always fail on a holiday, but if you can't get the fan spinning you're going to have to call in a HVAC specialist.

Posted on Jan 01, 2009

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My Honeywell dt200 is displaying a flame when I turn it on but isn't actually heating.


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My White-Rodgers Model #1F78 5/2 Day Prgm thermostat turns on and ighnites for a few seconds then turns off even after reprogramming or resetting. What should I do next to get the heater to start working?...


If the furnace or boiler burners actually light for just a few seconds and then go out, the problem is probably NOT the thermostat. Most likely the thermostat is calling for heat so the burners light, but there is a safety device called a flame sensor that will shut off the burners if it does not sense the flame properly. It is very common for the flame sensor to get soot, dirt, or oxidation on it and then it can not sense the flame and the furnace does exactly what yours is doing. Most of the time the flame sensor can be cleaned and it will work again. Sometimes a new one will take longer to go bad again. Typically they are a straight or "L" shaped piece of wire about the size of coat hanger wire that just sticks into the flame. The coat hanger type wire usually goes into a white ceramic base which in turn has a wire connected to the back end. Steel wool works good to clean the flame sensor, but if you use coarse wool or coarse sand paper the surface of the flame sensor gets rough and gets dirty faster. It is made of some kind of "polished" stainless steel.

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Inducer motor kicks on, it runs for a little bit, about 3-5 seconds, then you should see a bright yellow glow, this is the igniter, shortly after, you should hear a click and the gas should start to flow, almost immediately it turns to a blue flame. Then your igniter should turn off and the blower motor start up.

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Mar 02, 2011 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace cuts off before reaching set temp.


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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).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

CYCLES ON AND OFF EVERY 3 MINUTES NEW THERMOSTAT


Look at the bottom door on your furnace,and find the small lens.Watch the red light blinking, and count tthe blinks. It is probably a dirty flame sensor. Shut power off ,pull flame sensor out, and clean it with a "dollar bill", and reinstall it.If you are smart enough to pull the doors off your unit, the bottom door has a section on it telling you diagnosis light solutions.

Feb 16, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Temperature is not reaching set temperature. Furnace flames twice then stops, then fan kicks in and runs for 5 mins then stops. Then flames twice. Then stops working all together. The flame never burns...


Tara,
If flames go on and then go right out it is usually a flame sensor problem. These are usually found on newer furnaces with electronic ignition systems. It will be located in the flames of the burner farthest away from the ignitor. If you see an orange glow before the flames light then thats it! If ignitor is on the right side then flame sensor is at the opposite end. It is a round steel probe with a white ceramic top and a wire running to it that sits in the flame and is a little bigger round than a coat hanger. Shut off power, wait to make sure it is cool to the touch, using a piece of steel wool( or sandpaper if none available) give it several good strokes to clean it. You may have to remove it from the top by removing the screw and pulling it out. I usually can clean them without removing them but I have small hands! Turn power back on and it WILL run if that was the problem!!!!!!

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2 Answers

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I would check furnace filter first. If that looks good i would check the thermostat. To check thermostat turn power off to furnace then take thermostat off the wall and connect wires labbled R & W together then turn power on and check furnace to see if it runs for more than a couple of minutes. If so install a new thermostat. If that doesn't work let me know and i can give you a couple more thing to try.

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Turns on and Turns off


Does the furnace burners light? You could have a bad thermostat or a flame sensor. To check if it is thermostat turn power off to furnace take thermostat off wall take wires marked r & w and connect them together then turn power back on. If furnace comes on and stays on then you need a new themostat if not it is the flame sensor inside furnace. Also check furnace filter

Jan 13, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell Thermastat rth2308


Yes you can fix it in 10 min.
You wasted your money on thermostat. Problem is your flame sensor. your Furnace has a safety. When it dosen't sense the flame because of crotion build on the sensor it shuts itself off in 3 seconds. flame sensor is on the right or left side infront of the burner. it is about 2.5 to 3 inches long and about the size of Q tip. it is mounted with one or two #6 hex or sloted head screw. You may or may not have to take it out depends on what is in the way and how big is your hand ! any way you will have to run to the hardware store and buy a sheet of very fine grid SAND PAPER. Clean it very good with it. If you have Glow igniter that ignite the furnace. DO NOT TOUCH THAT. It looks like round spiral or W shape. you can't miss it thats the one that starts the fire. DO NOT TOUCH THAT. but you can clean the sensor without messing with the Igniter. you can only Clean the sensor 3 to 5 time then you will have to buy a new one. you can click on this link to know what sensor looks like.
http://images.google.com/imgres?imgurl=http://www.pse-usa.com/pics/sensor-2.jpg&imgrefurl=http://www.pse-usa.com/sensors.htm&h=300&w=400&sz=13&hl=en&start=1&tbnid=bWJA_1jFxpGyyM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Dflame%2Bsensor%26gbv%3D2%26hl%3Den%26sa%3DG

Please let me know if that works for you.
look at the igniter link you don't want to mess with this part.
http://images.google.com/imgres?imgurl=http://midwestapplianceparts.com/images/41-407-IGNITER.jpg&imgrefurl=http://midwestapplianceparts.com/heating-air-conditioning-122/&h=557&w=500&sz=31&hl=en&start=16&tbnid=la_Q0h6RdK4uQM:&tbnh=133&tbnw=119&prev=/images%3Fq%3D%2Bigniter%26gbv%3D2%26hl%3Den%26sa%3DG

Good Luck

Feb 24, 2008 | Honeywell Programmable Thermostat Heater

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