John Deere A75 The breaker on the motor trips off when the unit calls for more air after the initial fill. The unit will begin to fill the tank and when filled, shuts down. When more air is required, the switch trips for more air, but the motor will try to start (it hums) and after a second or so trips the breaker. As long as the motor does not cycle off it continues to work fine. Just when it cycles off is when the problem occurs.
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It probably has something shorted to ground or the compressor or motors are stuck causing a high amperage problem. The breaker is probably fine but it also could be weak but normally its the compressor or a component has faulted to the compressor. If the unit immediately trips breaker its probably shorted to ground. If the unit struggles to start and a few seconds pass before it trips then it may be a component fault.
The breaker tripping when you turn the unit on indicates a 'direct short' and 99 out of a 100 times the short will be either the outside fan motor or the compressor itself. Either way - you will need a qualified serviceperson to diagnose this problem correctly and make the needed repairs.
Best solution is to call AC person.
However, here's a good way you can get it down to either the fan motor or the compressor.
(1) With all power OFF - disconnect the wires to the fan motor
(2) turn on AC unit
(a) if breaker trips it means the compressor is probably the shorted component.
(b) if breaker DOES NOT trip and the compressor runs - it means the fan motor is shorted.
(3) If breaker tripped with the fan motor disconnected meaning the compressor is probably shorted you can then (with ALL POWER OFF) 'disconnect the wires going to the compressor' and re-connect the fan motor wires. Turn on power - and if fan motor runs (with compressor wires off) you know it's the compressor that is shorted.
After all this you will now know which of the two (compressor or fan motor) is shorted.
If it's the fan motor you can with 'limited mechanical experience' change the motor yourself, but if it's the compressor you will need to call a serviceperson because of the expertise needed to replace the compressor.
What you need to do is disconnect the compressor at the electrical access on the side of the unit. Check each wire to the grounding screw using ohm meter if you get continuity your compressor is shorted do the same thing for you condenser fan. I bet your compressor is shorted. Make sure power is off and remember where the wires go. Trace the wires that go to compressor back to the contactor and capacitor and disconnect them there. If this help please rate me and do a testimonial.
A circuit breaker 'tripping' everytime the AC unit kicks on 'most always' indicates a direct short (somewhere in the condensing unit), although it is possible that the breaker itself is bad - (but not likely).
Usually the cause of this 'short' will be - either the condenser motor in the condensing unit (outside unit) or the compressor - also in the condensing unit.
If you're mechanically inclined - and "very careful" around electricity - there is a fairly simple way to find out which component is causing the short.
Step 1 - Make sure the condensing unit (outside unit) is completely disconnected (electrically) , i.e. pull the fuses/turn off circuit breaker on outside unit and turn off thermostat.
Step 2 - disconnect the condenser motor (this is the outside fan motor). Note: when you disconnect the wires of the condenser motor "be sure" you mark/write their location, and wrap them in electric tape.
Step 3 - start the AC unit. If the breaker trips again you can pretty much rest assured it's the compressor that is shorted.
To prove it (without a doubt) - go to next step.
Step 4 - "be sure circuit breaker and thermostat is turned off" - and - 'reconnect' the condenser motor - and - then disconnect the compressor wires (mark wires and tape them).
Step 5 - Start AC.
If breaker doesn't trip - you know it's the compressor that is shorted.
If breaker 'does' trip again - then it's possible the breaker itself is bad (not likely) or there is a 'short' in the condensing unit's "wiring" somewhere (not likely).
My guess is that either the condenser motor or compressor is shorted.
of course comparative cost buying and repairing make a cost reduction.if your compressor run smooth but tripping,make sure where on the right path of diagnosing of your compressor,we can check if the motor or compressor is shutting off the unit.disconnect the belt from pulley of the motor to compressor,run the motor if still tripping w/o load its better if you have calmp ammeter test,to check the current rating,if it is tripping motor is deffective replace the bearing.f motor is fine sr till tripping check the compressor also the crankcase bearing,replace worn out bearing.have a nice day dont forget to fix my rate.thanks a lot.
Two things; outside does the compressor try to come on? If not you may have a switch\Thermotat problem. Also make sure the breaker to the outside unit hasn't tripped. If it has tripped there may still be a problem after you turn the breaker back on. If it's only the fan that's not coming on outside you will need a new capacitor or fan motor and compressor(if the fan motor is replaced you should have a new capacitor also. If it has been intensely hot your unit might have just gotten overworked. Then resetting the breaker is all that is needed. If you have continuos resettings you MUST call a qualified HVAC Tech.