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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).
Bill, first thing, make sure the outdoor coil isn't stopped up with dirt. This will cause the compressor to overheat and possibly trip the breaker. If you you can check the amp draw that would be good. Look on the data tag on the outside unit and look for RLA or "running load amps". Running amp draw should never exceed this number, it should actually normally run 10% under RLA. If its real hot where you are like it is here (109) it will be running close to RLA. If you coil is stopped up with dirt, etc., turn off the breakers, use you water hose and sprayer and carefully wash out the coil. If all this fails, and your amp draw is good, change your breakers. Hope this helps , stay cool.. Mark
High amp draw can be caused by a few different things, so first check that incoming voltage to trailer is sufficient. (115 volts) Not unusual for some parks to install more hydro hook-ups on a feed line, and when all are up and running, your incoming voltage could be decreased. If your o.k. that way, then I'd start looking at the compressor circuit of your ac, in particular, the compressor start-up capacitor. The capacitor basically stores electricity and boosts it to higher voltage for compressor and fan start-ups to reduce current draw that will trip the breaker. Please have a knowledgeable electrician, or RV tech check this for you, as a capacitor can give a real good high voltage (possible fatal) shock, even when power is off to unit. I also suspect that the start relay has shorted (welded) itself due to high amp draw situation, and that is reason it comes on by itself.
It could be any of several things. It could be that the system doesn't always equalize (usually when the system has a thermostatic expansion valve) and compressor won't start against the pressure difference. Usually a hard start kit will solve this problem. You may already have a hard start kit and it may be bad.
You could have a bad capacitor, causing the compressor to have a high amp draw and the windings getting hot and the internal overload in the compressor tripping until it cools off.
You could have a bad comprressor drawing high amps and tripping the internal overload.
You could have a dirty condenser, causing a high pressure swith to trip.
Your fan motor can be bad or running slow and not at full or proper speed.
You really need to have this checked out by a HVAC service technician, It's not good for the compressor to let this go on for very long.
'Breakers' - are tripped because they are exceeding their amp limits.
The 'hotter' it gets outside - the 'harder' your AC has to work - and under normal circumstances this is not a problem - but when you have a fan motor or a compressor that is starting to 'break-down' (electrically) - often the AC's amp draw will exceed the limits of the breaker - thus 'tripping' the breaker.
I would suspect either the fan motor or the compressor is causing your breaker problem.
Eventually - the component (either the fan mtr or compressor) that is 'going bad' will go out completely and your breaker will 'trip' and not stay on when you try to reset it.
At this point you will need a Service Tech to determine which one is bad.
There is a possibility that your condenser coil (the one that blows hot air) is 'dirty' which will also cause a problem similar to the one you have - but it is less likely.
Also - if you've had the AC 're-charged' lately - it's possible you are in a 'over-charged' condition - but again, this is not very likely.
The compressor motor , once warm is grounding out due to wear and is going bad.Have the compressor replace while it is still clean is cheeper and easier that doing it after a burn out,which will eventually happen,if the compressor is tripping the brreaker as I suspect..