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Trane XE-90 pressure switch

Posted by Karl Fiebich on January 31st, 2004 10:05 PM
In reply to XE90 Pressure switch by RSD911 on January 24th, 2004 02:29 PM [Go to top of thread]

7 of 8 people found this post helpful

My furnace cut out on pressure switch (three blinks on the red LED). The service tech said it was faulty. He missed the real problem which was a blocked condensate trap. Condensate was backing up in the combustion chamber and flooding the pressure switch pickup tube, this resulted in a loss of vacuum causing a shutdown. Repeated automatic restarts with flame ignition and immediate flame-out were occuring after turning the furnace power off and then on again. Before you let the service tech whack you for a new pressure switch, tell him to check the plastic drain hoses, the drain trap, and the pipe to your floor drain.

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