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The ventor motor makes no noise at all. It doesn't run at all.

Should the venter motor have 120VAC? Because it only has 8VAC. Maybe a bad control board?

No, nothing is running at all. The call for heat goes in, then a few relay clicks in the unit, then the LED flashes 3 times constantly. I'm stumped as to what is going on.....please help.

Hello all. My six year old Trane XE90 refuses to produce heat. I go to turn the unit on and nothing happens. The circuit board will blink acknowledging the call for heat, then about 5 seconds later will blink indicating a pressure switch problem (3 blinks). I took the switch off and metered...