Sounds like the pump pressure needs adjustment. If it's off from spec, (even a fraction), the unit will not fire up and run. If you still have your owners manual, check to see what the pump pressure is posted for. (probably around 3.5 PSI). Also, check for clogged fuel filter a that will restrict fuel flow and pressure...
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I'm not sure if the thermostat is wired correctly. First, the thermostat is wired directly to the outdoor unit (compressor/condenser unit). It is NOT directly connected to the indoor unit. It connects to a low voltage control panel in the outdoor unit that sends a signal to your indoor fan/evaporator. This wire is called the fan relay switch and physically runs between the low voltage controls of the indoor and outdoor units. If the fan relay is bad it's possible that the unit runs continuously. To prevent destroying your outdoor unit there is a safety feature that prevents the indoor fan from shutting down while the outdoor unit is running. If the indoor fan did shut down while the outdoor unit was running than you would slug your compressor. That is, your compressor normally sees refrigerant gas but is instead seeing refrigerant liquid. That would not be good since this scenario would destroy your compressor. It sounds like a faulty fan relay. The actual contactor portion of the relay is in the outdoor unit.
gas or electric furnace? sounds like bad sticking t-stat but could be sequencer or gas valve. The fan will continue to run if the unit is hot safety feature so the fact that the fan continues to run does not mean the t-stat is diffidently bad.
I believe these models have a thermal switch on or near the heating element that normally runs the fan until the element has cooled. Similar to your home furnace. If the fan never shuts off this switch is likely bad. IF it takes a long time to shut off then it may be out of calibration. In either case they are non repairable parts and have to be replaced. If the heater is in a high spot resulting in a high ambient temperature it may take a while for the fan to shut down.
No the fan out side is for a condensing unit and compressor. The compressor should not run with the heat. I am almost positive that if this is not a heat pump that the compressor unit should not be running.
You probably have a plugged orifice. The gas is injected into the burner via a small orifice and, when this plugs, the air / fuel mix is altered, causing the orange flame. Find your owners manual to find out how to replace the orifice or you could take it to a small engine repair facility locally who should be able to fix your problem. Hope this helps!
There will be sufficient gas flow to light the pilot and get a flame prove, then the main burner lights, you will probably see the pilot flame reduce somewhat, and no longer fully surround the flame prove sensor.
When the unit is relighted, the complete sequence starts all over again.
Have the gas regulator checked and adjusted (if adjustable) or replaced by a qualified technician.