Question about Honeywell Power Humidifier: Furnace Humidifier/ Humidifier

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Emerson furnace is not igniting

What does it mean when the code says thermo divice is open and my ignitor is not glowing?

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  • Stephen Evans May 11, 2010

    it almost sounds like a limit switch is open. There may be several little round devices about the size of a quarter. some have a little red button on them you can push in to reset them. One may be on the blower housing itself, But this is rare. Usually there is one near where the chimney hooks to the furnace or by the burners themselves. they will have 2 wires going to them. Not all of them have reset buttons though. If this is the problem you will want to find out what caused it to trip. Steve

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Your ignitor is bad
it is an open circuit
its not glowing because it no longer holds resistance

Posted on Oct 06, 2009

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Limit switch may be stuck open.open top door on furnace switch is round with little black hose on it. disconnect hose from furnace side and **** on it to see if it will close.reconnect hose and try furnace

Posted on Oct 05, 2009

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3 Answers

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Hello Genna,
I am not a furnace guy but I may be able to give you a few ideas of things to diagnose the problem and get it resolved. First off, I assume you have a thermostat that you use to to turn your heat on. If it is a generic ( meaning : non programmable model) then you should be able to try this simple test. Remove the cover ( typically they snap on) around the thermostat so you can see the control mechanism inside. You should see few skinny wires ( similar to those used on a telephone wire) solid copper in various colors.. When you rotate the dial on your thermostat to call for heat, there is a small glass vial that has a drop of mercury ( which is electrically conductive) in it that makes contact and shorts two control wires together ad that is what calls for heat on your furnace. When the temp inside the room where the thermostat is reaches the tempertaure you requested, the bimetal mechanism either contracts or expands to reposition that glass vial to shift the mercury off the contacts and your furnace shuts off... That is the basics behind how your thermostat and furnace work ( generally speaking) If you can identify the two wires inside the thermosat that are shorted together when that vial of mercury shorts them inside it.. you can temproarily unhook them ( they are low voltage.. normally 24 Volts or less) so no worries about getting ashock or anything.. and short them together for a minute or two.. by doing that... your furnace should turn on and heat should flow.... Once you start your furnace this way.. unhook these two wires and your furnace should shut down .. It may take a minute or two ( depending on the control for it) If it doesn't..then your problem is on the furnace side and you may need to get the furnace control system serviced or replaced.. if it does shut down, then your problem is your thermostat and thats a simple replacement.. Also.. make sure the thermostat was properly leveled on its base.. The position of the thermostat ( meaning level) will dictate when that mercury makes contact and your furnace switches on.. OK..I tried to explain the works of this to you but here is a link to a Honeywell site that explains it in simpler terms.. The part about shorting the two wires together and then opening them will aid you in identifying where the problem actually is.. here is the link: http://homerepair.about.com/od/heatingcoolingrepair/ss/thermostat.htm

Hope this helps you more than confuses you..
Regards

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3 Answers

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I would guess from the info provided that you only have two wires going to your thermostat which would explain why the fan switch doesn't work on the thermostat. You can bypass the thermostat as a first step in troubleshooting. After that it depends on the type of furnace, standing pilot or electronic ignition...

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