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Old 11-11-2008, 03:14 PM   #1
dsf
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I have a coleman mobile home furnace model DGAA056BDTA. I'm having trouble with the draft proving switch on the flu. It makes when the furnace is warmed up, but once it cools down it wil not make again unless I physically blow on the lower tube leading to the switch to get the furnace to light. I live at 7 thousand feet and I wondered if there is a high altitude switch or an adjustment on the existing switch?

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Old 11-11-2008, 05:35 PM   #2
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check the intake for birds nest etc ive also seen the paint inside the draft fan housing start peeling and block proper flow if none of that helps if the switch is made of metal (the diaphram) with the switch on the side use your lips like youve been doing to watch the switch operate and you can bend the switch in the appropriate direction to make it less sensitive

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Old 11-11-2008, 06:12 PM   #3
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The flu is clear of any debris, i've already checked. The switch is a sealed switch so no spring or device is visible. Is there any other way to adjust it, or maybe there is a high altitude switch that you know of
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Old 11-11-2008, 07:37 PM   #4
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the switch should be mounted on the side of the diaphram where the wires hook up if not im out of suggestions no hi alt setting or adjustment you can purchase a mannometer and check vacuum or just rpl switch
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