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call the service technician / electrician for a repair /quote
could be damaged insulation from vermin infestation but it is dangerous and needs urgent diagnosis and repair
leave the circuit breaker off if it is on it's own circuit or tape the switch off if it is not
If it trips the circuit breaker as soon as you turn the FAN on, suspect either a bad fan motor or a failed fan motor start capacitor. If you are able to turn the fan on but the circuit breaker trips as soon as the COMPRESSOR starts, it is possible that the compressor is seized. If, on the other hand, the unit is tripping a GFCI (Ground Fault Circuit Interrupter) breaker or GFCI utility outlet, it is possible that neutral and hot are reversed at the outlet into which the trailer is plugged (happened to me this year at an RV park).
Hello jerrydj1021 - Often when the breaker trips, it is a
mainly because there is too much current running on one circuit. Is the unit
plug into a GFI outlet? It is not recommended to use GFI outlets or too many
appliances plugged into that one circuit. Try plugging the unit into another
direct outlet and see if the breaker trips again. I ask that you please follow
up with a comment on the post, at your convenience, to advise if further
troubleshooting is needed or if the unit's status has changed successfully.
It could be one of several reasons why the inside unit is not running - but the most likely reasons are 1. the breaker is off - you need to turn on breaker or reset it if it's been tripped
2. the inside motor is bad and needs replacing
3. you have a problem with the thermostat and it's not turning on the motor
4. a relay or some other electrical component is bad
Obviously, the breaker is the easiest solution and I'm hoping that's all that's wrong with your unit.
If it is not the breaker - the other things need to be checked out which may or may not require you calling a serviceman.
you have a 'direct short' - most likely the compressor or fan motor.
you could isolate it to one or the other by (be sure all power is off) disconnecting one of them and turning the unit back on.
For example if the fan motor is shorted and you disconnect it - the breaker will hold and not trip and the compressor will come on - which will tell you that you need to replace the fan motor.
If you do this and it still trips the breaker then reconnect the fan motor and disconnect the compressor and try that.
If the breaker holds and the fan motor runs then you know the compressor is shorted.
Note: the fan motor can be replaced with not a lot of trouble depending on how mechanically inclined you are - but the compressor will take a qualified serviceperson.
What you described 'shouldn't' be happening - "if" the outside fuses and the inside breaker are sized correctly for your air conditioner.
I would make sure that the fuses in your outside disconnect were the proper size (for your AC), and that the inside breaker was of suffienct size to handle the air conditioner, and whatever else might be on the circuit.
Note: You would never want the 'outside fuse size' to be bigger than the inside breaker.
For example: 50 amp fuses in the outside disconnect and a 40 amp inside breaker is a no-no.
Often, for whatever reasons - someone will put larger fuses in the outside disconnect than what is called for.
When this happens the inside breaker is the only safety on the AC.
The problem is - for whatever reason - your inside breaker should not be tripping off.
It's likely that the AC may be on a inside breaker "that also has other things i.e. dryer, electric range or Refrigerator," and therefore any of these components 'including' the air conditioner could be causing the inside breaker to 'trip.'
One way to check this would be to 'un-plug' whatever else you had on the inside breaker - and then run your air conditioner and see if the breaker trips. Let's say you have the refrigerator and the air conditioner on the same inside breaker. You suspect the refrigerator is causing the inside breaker to trip - so you unplug it - and then turn on the air conditioner. "Now" it does not trip the inside breaker and assuming you have the proper fuses in the outside disconnect - you could safely say the air conditioner is ok - but - the refrigerator might be on the blink.
It's also possible that you just have too much on the inside breaker and you need to plug the refrigerator in to another outlet.
Still, if it was me - I think I would really think 'hard' about calling a Service Tech out - and let him/her diagnose the problem.
You need to start with a basic inspection in the outside unit. For the breaker to trip immediately like that indicates a dead short. With the breaker OFF look at the internal wiring between the contactor relay and the compressor. You are looking for signs that the insulation may have been chewed by a rodent, or a wire is off of a terminal and in contact where it shouldn't be. If the wiring looks good, terminals pass tug test etc. you may have a shorted capacitor. Make sure to check the wiring for the fan too. You can disconnect the com lead for the compressor and fan one at a time to isolate the defective component if needed. Work safe! turn the breaker on for the test, and off again before you put your hand or tools back in.