Payne py1pnb036090abaa blower motor windings are burning and the motor will be burned out

On your control card for your furnace check the fan motor taps for power supply with a multimeter for having the proper voltage. Most control cards have two wires to control fan speed in heat mode and another speed for cool mode operation. You can locate the normal wire colors on the control schematic (electrical drawing) to see if the wires are connected properly.

If your motor has been wired improperly you may have already damaged the windings in the motor and you will need to replace the motor. It only takes about a minute at the wrong voltage to burn a motor up.

You may have a bad capacitor. Most fan blower motors operate at different speeds in heat mode than cool mode and get their voltage applied to different windings in the motor to get different speeds. Most windings need a capacitor to get current and voltage back in phase to increase efficiency, but if the capacitor is bad the motor can run in one mode and can even reverse direction in another mode.

Sounds like I just figured out your problem, get a new capacitor.

Confirm that you have power reaching the motor windings. If positive, then the anomaly is centered around the motor.

Probably burn out one of the speed's windings.

If your original blower burned up, or if the original resistor failed, it is likely that some of the wires leading to the resistor and blower BURNED slightly in the process, and will need to be replaced all the way back to where they connect to the fuse block. (The wires may have been pinched or otherwise damaged somewhere, so they no longer carry the amount of current required, causing the resistor to fail due to a low-voltage over-current condition.) Sadly a failed resistor can also burn the motor out. Check the windings of the motor (via the connector) using an ohmmeter to see if it is still good.

Not sure what a burning header smells like, but I would expect two possible smells. First, if the blower motor itself is going, you might smell the windings getting hot - like a transformer burning. If this were the case I would expect that the motor wouldn't spin on the low speeds.
The other smell you sometimes get is when the heater core leaks. Then you will get a coolant smell inside the car and sometimes (usually) a wet carpet as well.

Common sources for a burning smell in order of most likely, depending on how your spa was equipped, in my opinion would be:

Blower motor - Worn out brushes on a DC motor arc heavily and will give off an odor.
Heater - Elements build up scale over time with less than ideal water chemistry and will give off an odor when heating.
Pump - As a pump nears total failure it can overheat enough to begin to burn the winding insulation and tie down cords causing a burning smell.
Control box/electronics - least likely but a failing relay or GFI recepticle can also burn and eventually fail.

John

3 ton cooling capacity 90,000 btu heat capacity. In Vermont it would be enough if the home was a 4 or 5 star home. Remember it is only 80% efficient so you will only net 72,000 btu output.

The blower motor may have burned out or the control board you will need a multimeter to test motor leads of the motor. You need to ohm out the motor windings to see if they are open if they do not ohm out then the motor is probably burnt or on a thermal overload in which case you will have to let the motor cool down and see if it will restart after cool down.

A broken/burned motor winding will do exactly this. If you measure it when cold it will look good. The broken/burned winding will only open from heat expansion.

The motor winding burned out. Perhaps the motor was very hot when the vac was turned off after the last use and the insulation of the motor windings broke down when the air stopped moving thought the unit. Perhaps also the polarity of the receptacle it was plugged into is reversed or the plug on the vacuum is not polarized. Those things in combination could cause this but this is kind of a long shot guess. In any case the blower motor is likely burned out and will need to be replaced and checked out.