It might be a good idea to take it to an auto shop that does RV repairs. That way they can take a look at it and see what might be wrong with your RV. That is something that I would want to do if I had an RV. http://www.swdieselservice.com/services
I'm assuming when you say 'doesn't work' you mean 'nothing comes on,' i.e. the fan or the compressor.
If that's the case I would check for the AC breaker to see if it's tripped. Usually a 'tripped' breaker will look half on and half off, but sometimes it will be completely in the off positiion. Either way - it's usually because of a malfunction of the AC unit, so if that's the problem I would moniter it closely to see if it trips again. If it trips again in the immediate future I would then want to investigate the AC unit for the cause.
Also, some RV's have fuses in the AC circuit - so you could check and see if you have any fuses labled AC or AC control voltage. If so - you can usually - tell by looking whether they are bad or not. If that's not possible try replacing your 'AC labled fuse' with a new one of the same size.
I would also check your power supply (where the power cord to your RV plugs into) to make sure it is providing the proper voltage to your RV. Note: They also have breakers out on the box that you can reset. If they (breakers) appear ok - and you are at a RV park you could have the Park personel - check and to be sure the proper voltage is availible to your RV.
good luck!
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Can you give a brief description of what or what not it's doing such as, Fan mode works, but when switched to cool, nothing happens etc...
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