I have a Tran XL90 - Model #: TUX100R948W6 It does not turn on in the "Auto" position on the thermostat. The fan does come on in the "On" position. However, it doesn't blow hot air. It has 3 flashing read lights, with 3 flashing green lights; then consecutive green flashing light. -- constantly. I have replaced, the Igniter, Flame Sensor, Flame Rollout Limit Switch & Pressure Switch. The Draft Inducer Fan Motor does not come on at all. For my furnace, the Diagnostic Codes reads: 3 Flashes - Pressure Switch Fault Any input as to why my furnace doesn't work. Cannot afford a repairman. Thanks, in advance. I was speaking with someone earlier and had to scrape up funds for a new circuit board. Now I have two lights flashing. The furnace now starts in the auto position. However, once it cycle's off, then tries to cycle back on for the temperature setting, the flash comes on then shuts down. Hence... cool air. Any assistance there.