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Ordered a new switch and will arrive tomorrow. Will update. Update: My new pressure switch arrived. Put it to replace the old one. The furnace back to work. Thank you guys for the help.

My contractor just extended the exhaust pipe to ~9" tall. I assume it is clean inside. The inducer motor/drain tube are also clear.

Got 3-flash code for pressure switch problem on my trane xe90 system (~15 year old). The inducer fan runs with normal sound. Can see the turning of fan. Opened the front tube to pressure switch and saw water dripping out. Dirty brown rusty water also came out of the front hole on the pressure...