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What is the brand and model number of your unit? Have to made sure the exhaust vent is clear? if so how did you do that?
How do you know that? If you have a new original equipment switch and the tubing connected to it is not kinked then the only possibilities are; a (partially) blocked exhaust or intake vent, blocked port(s) where the switch tubing connects to the unit, condensate back up, a weak fan or a bad board or possibly a bad connection between the switch and the board.