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It seems like the blower motorr is not kicking in. Turn breaker OFF, remove the grill, check that electrical connections are nice and tight, and turn breaker back ON, start unit and see if evaporator coil is gatting cold, if so, Turn Breaker off, remove blower motor capacitor and test it, if capacitor OK, blower motor needs to be replaced.
Does the fan seem to labor when starting up. (basically starts up but seems slow to get up to speed?) Then when fan is turning at normal speed, the power inside seems to go back to normal?
Check your voltage to the unit. Be sure to use a big cord when hooking up your camper. Does the unit have a wall mounted thermostat? Does the blower run? When was it cleaned last?
make sure the system switch is in the cool position, then press run program button and allow a couple of minutes for system to cycle on, if it doesn't come on press the button for lowering the set point, set it to 72 degrees and then press the hold temperature key.
Check the air directing servo motors under the glove box. they are 2 black boxes about 3"x3". you have to clean the contacts of grease with contact cleaner spray or alcohol.
Turn off unit supply and check the blower wheel inside the indoor unit by rotating it manually by your finger if the blower wheel rotates freely then there is something wrong with your fan motor or fan motor capacitor. But if the blower wheel is not rotating freely try to check the fan motor for lubrication or some bushing dried of and no oil
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