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the tube on the pressure switch runs to a fitting on the furnace..pull the tube and poke that fitting clear with a drill bit or paperclip all the way through. Check tube for cracks or bad seal.
Use shop vacuum to clean exhaust pipe....let me know result
trim the tube...make sure air tight. we need the air flow created by the exhaust fan to close the switch through the small tube
99% of the time the intake has something in it since it draws air
did you shop vac the drain from furnace to purge all old condensate out?
there is a tube from furnace that drops to the pump...just apply as much suction as you can directly to that tube...
has the furnace been running more reliably?
the line from the exchanger is main line.
When it is pressure switch fail we need to make sure:
Both exhaust and intake pipe are clear
Drain is clear
pressure switch tube is secure and tight
tube fitting is clear
If all of that is in order...there is always a chance we simply have a weak pressure switch.
correct...if not..the pressure switch is worn and needs replaced.
the trap is there to prevent air exchange thus holding water in the furnace...the trap will "move" when the inducer kicks on...
Sounds like you nee a new switch.
The water in the trap is normal and should disappear when started, that is working as it should to answer your question.
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Yes I would agree if you remove the pressure tube from the pressure switch lick you finger and seal the tub on that end and start the unit when the inducer starts up do you feel suction on the tube if you remove your finger and put it back on there should be some suction there.
Have you purged with the shop vacuum? (important)
Have you tried running with the intake pipe removed If 2 pipes present..one is exhaust and one is intake) to make sure no pipe blockage?
Did you clean out the fitting the tube attaches to on furnace?
The shop vacuum to furnace should purge everything.
I know you want to find out before buying a switch...but without air testing manometer for pressure through the system, amp draw of motor it is hunt and clean.
You can pull the draft motor and check...but eventually you buy switch or invest in a manometer to test pressure at the pressure switch