Trane Furnace's red light flashing 3 times tells you either there is an issue with your furnace pressure switch or a fault with the ventilation. Plus, clogged inducer fans, blocked condensate drain and pumping lines are also responsible for the red light blinking 3 times. To fix your furnace's 3 blinking instantly, check and validate. I was hoping someone could help me. I have a 6 year old Trane XR90 Furnace that blinks 3 red lights when it calls for heat, then it shuts down. 3 Red Lights means "Pressure Switch Error". This is what I have tried to fix this. · I have unhooked the hose that runs from the switch to the gas valve and to the burner box and cleaned the hose.
Discover what the red blinking light means on Trane 90.Call this number for more information 877-355 8461. Unfortunately, the user manual of the Trane XR90 furnace offers no explanation of what the blinking light means that can be seen behind a small hole in the bottom front panel of this high-efficiency gas furnace. The codes are explained on a wiring diagram that is glued to the back of the panel.