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From hat you have described, it sounds like the fan motor or the compressor is overheating and you should stop using the unit immediately. Especially, since it's tripping the circuit breaker. As far as how to repair it is concerned, you won't be able to tell if it's repairable until it's dismantled and all the systems are checked. Plus, Fedders as you knew them, when you purchased this unit, no longer exist. Some parts are still available, but they are in few supply. You may simply want to replace this unit.
first,make sure the fan blade hasn't gotten stuck on the shroud and cannot turn,then shut off machine and by-hand rotate fan and see if it spins to a stop after several rotations,if it stops quickly there is a bearing problem with the motor,this is normal after many years of service,then replace the motor
Take it out, and search the part number on line, they are bout $40 with s/h. however my current discovery: It made no sense to me that despite no visual issues, the fan motor is bad.So, with further research it turns out that the true culprit is the small thermistor/thermal fuse between the orange wire (ground) and motor winding wire. The thermistor is taped underneath the silver aluminium and yellow tape on the fan motor. I heard about this bad (open/no continuity) thermistor makes almost >99% of the fan motor problem regardless of any brand name because this cheap c-fram fan motor is NOT made in USA. I opened the motor, there is a silver (aluminum wrap) around the windings for the motor that needs to be cut. Careful not to cut the motor windings. Inside there is a thermistor or type of temperature sensor connected between the orange wire and a motor winding wire. On my motor this was no longer working. The part marked "JET 123 NM1 2A 130C" is a thermal fuse. The 130C is the temperature rating. When the motor get hot (130C / 265F) the fuse opens. The circuit is broken and the motor stops.
The motor is still good. The fuse is blown. It must be replaced to get the motor running again. You could bypass the fuse but then you invite a fire hazard.
Shut the power off to the unit, spin the fan blade to see if it spins freely. If it doesn't spin freely, (there appears to be a little drag when you spin it),the bearings are bad, if it does spin freely, then try moving the motor shaft from side to side if there’s any play in the shaft side to side then the bearings are worn and motor needs replaced. Then, check the capacitor, if it’s bulging even slightly, the capacitor is bad and needs replaced. Most of the time people replace the capacitor if motor seems ok. If capacitor is ok, turn power on to see if the motor is getting the proper voltage, if it is and not trying to run, then the windings are probably open, the motor's bad and needs replaced.
You can purchase a new fan motor. But the same problem will probably happen again. I opened the motor, there is a silver (aluminum wrap) around the windings for the motor that needs to be cut. Careful not to cut the motor windings. Inside there is a yellow thermistor or type of temperature sensor connected between the red wire and a motor winding wire. On my motor this was no longer working (in effect it was an open circuit). Once replaced the motor worked fine. this is the second time in about two years that this problem happened. The first time Sears fixed for about $100 and three weeks. This time I saved the money and did the repair myself. I would guess you could buy a new thermistor for about $5.00 from a parts house like digiKey or National Electronics. You will need to know how to use a soldering iron to repair this.
I've seen abunch of these. The fan motor has a fuse wound into the windings. It cannot be replaced you need a new fan motor. The motors seem to run hot normally, leading to a short lifespan.
I suggest buying a better brand unit.