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duane freeman
10-27-2004, 08:38 PM
this unit will only run if the burner box cover is off or if the intake pipe is disconnected. Anyone ever have this problem?
rubobornot
10-27-2004, 11:28 PM
check the intake and exhaust pipes for the correct diameter and the number of elbows.
Stamas
10-28-2004, 08:14 AM
Try moving the ignitor an RPH toward the flame.
mattm
10-28-2004, 12:39 PM
There's a bird stuck in the intake.
chucko615
10-28-2004, 12:40 PM
There's a bee's nest in the intake.
spotts
10-28-2004, 01:17 PM
holding a tennis ball in his mouth in the intake.
chucko615
10-28-2004, 01:26 PM
Originally posted by spotts
holding a tennis ball in his mouth in the intake.

Yeah, but what brand is the tennis ball........ROTFLMAO. :D
hvac student_4063
11-05-2004, 11:33 PM
this unit will only run if the burner box cover is off or if the intake pipe is disconnected. Anyone ever have this problem?
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I had/still have this exact problem. I thought there was a restriction, so I cut the intake pipe apart and sorry to say...no squirrel, bird nest or tennis ball. I went to Lennox late this afternoon and got a pressure switch, will put it on Monday. Then I got to thinking...I forgot to check the pressure switch tubes to see if they had water in them.

Any other ideas? This one is driving me nuts!!!