Furnace pressure switch line/nipple question
#1
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Furnace pressure switch line/nipple question
I recently had my inducer/exhaust fan replaced and several times since have found the new inducer fan running but the unit wouldn't fire up. On investigating I find that there are three hoses to the pressure switch. One is marked "-" and is attached to the inducer fan housing. The second marked "+" and connected to the "ignition box" (right name?). The third connects indirectly to the pressure switch by a "T" to the same place on the "ignition box" as the "+" hose, and is then connected to the "gas regulator" (right name?).
The non-flame up only happens occasionally, and can be overcome by sucking on the hose attached to the negative nipple.
Important point: The hose to the pressure switch that connects to the nipple marked "+" has a small plastic plug in it, that fits up into the nipple but cannot enter the nipple because of a small flange on the plug. The hose will fit over this grey plastic plug. This plug has a slot shaped hole in the flange end and a long slit and rectangular opening on the long shaft of the plug itself. Air can move through this plug.
Finally, here is my question: Is this plug a functioning piece of the pressure switch? Or just a leftover piece from when it was packaged?
The non-flame up only happens occasionally, and can be overcome by sucking on the hose attached to the negative nipple.
Important point: The hose to the pressure switch that connects to the nipple marked "+" has a small plastic plug in it, that fits up into the nipple but cannot enter the nipple because of a small flange on the plug. The hose will fit over this grey plastic plug. This plug has a slot shaped hole in the flange end and a long slit and rectangular opening on the long shaft of the plug itself. Air can move through this plug.
Finally, here is my question: Is this plug a functioning piece of the pressure switch? Or just a leftover piece from when it was packaged?
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Bump!
Nobody has ever heard of this? Surely someone has seen this little grey plug before! If it regulates pressure on the "+", and I take it out, what will happen.
Even negative replies are welcome ("I've never seen/heard of this plug before."). If no one has ever, ever seen this before then I will feel better taking it out and seeing if it fixes the problem.
Nobody has ever heard of this? Surely someone has seen this little grey plug before! If it regulates pressure on the "+", and I take it out, what will happen.
Even negative replies are welcome ("I've never seen/heard of this plug before."). If no one has ever, ever seen this before then I will feel better taking it out and seeing if it fixes the problem.
#3
it is part of the pressure switch and is required! A few questions. Is there a diagnostic code on the control board? Led flash? I'm assuming if you have a code it is a 3 flash. But I want to confirm this before going any further in the Diag. Please post the make and model of the furnace also.