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 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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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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