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Low freon switch prevent the compressor from running when there is not enough freon to carry the oil to lubricate it. There is almost always enough pressure to start it but as soon as it's running low pressure drops and the compressor stops.
ADDING FREON IS A LITTLE MORE COMPLEX AND BEST LEFT TO A PRO, YOU CAN MAKE SURE THE FAN IS OILED AND THAT THE FINS ARE CLEAN, TAKE NOTE IF YOU SEE A OILY SPOT ON THE UNIT THIS MAY BE THE SIGN OF A FREON LEAK ,, IT MIGHT BE WELDED AND RECHARGED .. THATS MORE BETTER THAN BUYING A NEW UNIT CUZ THESE AINT CHEAP !
JAY THE POOL PUMP GUY IN LONGWOOD FL
If the Air comeing out is the same as the temp inside the RV make sure the compressor is running and not just the fans. It could be low on freon. If freon is ok then you would need to ck the wiring to the selector switch for a short. It would be obviouse because there will be melted wires. I am leaning toword low on freon since you have already been inside the wiring/control unit.
Turn the ac off go up top the coach and remove the cover. Look for fan blockage, Wasp, mud dauber etc. Caution if it is wasps they will chase you off the end of your coach. Take some spray with you. If there is no blockage the fan motor is toast. Thanks for using Fixya Jerry
Same problem. I have a 2005 on a Rockwood Roo. Worked fine in October 2009. Not working June 2010. Problem is not a freon leak, compressor went bad. I banged the compressor gently with rubber mallet then with a hammer but that did not work. The fan runs, the compressor runs but gets hot. Also no indication of freon moving through system as everything gets warm from the compressor outward.