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Old 11-06-2010, 11:45 AM   #1
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Ruud furnace problem


I have Ruud gas furnace 75k btu that runs great without fresh air pipe connected but runs intermitently when the pipe is reattached..Pipe clear of blockages..<15 ' of pipes. Any idea what is happening
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Old 11-06-2010, 12:03 PM   #2
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Ruud furnace problem


Pressure switch failing. Ventor fan slowing down. Need a manometer to check the draft thru the furnace and rating of the switch. May have an inlet screen where the pipe attaches to the furnace/burner box with debris in it slowing down the draft. Some Carriers and Lennox do.
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Old 11-06-2010, 07:45 PM   #3
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Ruud furnace problem


Could also be recirculating the exhaust into the intake. Have seen that happen more then a few times due to someone cutting off the vents or placing something in front of them to block the view of the pipes.
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