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Old 05-04-2016, 10:20 PM   #1
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Atwood Furnace

I turn the thermostat up, furnace starts to click but will not light.
If i go outside while it is clicking and put my hand over the vent (create
back pressure?) the furnace will light everytime. Sail switch problem?
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Old 05-04-2016, 11:55 PM   #2
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Originally Posted by tban View Post
I turn the thermostat up, furnace starts to click but will not light.
If i go outside while it is clicking and put my hand over the vent (create
back pressure?) the furnace will light everytime. Sail switch problem?
Probably the sail switch, but it could be debris inside the chamber. Try taking the access cover off the burn chamber (just a couple screws hold it on) and clean out any flakes/debris that might be built up in there.
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Old 05-05-2016, 12:39 AM   #3
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The sail switch allows ignition when there is sufficient airflow. I have no idea why restricting airflow would cause more airflow and overcome a sail switch issue, so I would guess that the burner is dirty and so is not getting enough gas at the igniter location.
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