COLEMAN MACH 3 MOUNTING ON INSIDE OF CAMPER NOT ALIGNING WITH MY

all dimension and other information is available form the manufacturer web page or retail outlet
if not take a tape measure and measure it yourself and take the unit to a public weigh station and weigh it

If this is a park model trailer like mine, there is a transformer in what they call the ceiling package. It is mounted up inside the return air plenum.

There are grooves on both sides of ac unit on a camper and it drains down the roof to a little gutter that travels the water towards end of camper and drains. Most of the time down the side of camper, but if these Grove are stopped up it will not allow it to drain and cause it to overflow inside camper. If filter is very stopped up or evaporator coil is stopped up, fan not running, low on refrigerant, or having the thermostat set way to low can cause it to freeze up and when this water thaws out it is too much for the drain to handle and also ice could be sticking being the drain pan melting causing it to go in your camper. I would check filter and those drain grooves first.

It is possible that the drain hole on condensate pan is plugged and causing water to over flow pan. Remove cover from unit and check drain line.Clean coils andpan as best you can and clear drain hole. Add a small amount of bleach to water in drain pan.This will kill any algea or bacteria that may be growing in condensate water and plugging the drain. Thank you

Have you checked the high and low pressure switches on the unit? If you are cycling on and off, look at your pressure switches to see if they are opening during operation. Also, when was the last time you cleaned out the condensing unit coils with soap/degreaser and clean water?

if it is a programmable thermostat you can unhook thermostat and when it comes on select 3 instead of 1. As it sounds as though it is short cycling this happens in older houses with drafts. Hope this helps Tim

The clicking your hearing from the AC is probably just the 12 volt side of the circuit to run the AC, but it does indicate that the controls/thermostat is doing it's job, but doesn't sound like hydro is getting to AC as well as microwave. I can't imagine those being on the same circuit as far as breaker panel goes, but who knows what might have been done before you got it, unless bought new. Do you by any chance own a plug in circuit/receptacle tester, or anything like that to test for power? In the meantime, make sure AC is in off mode, then go to breaker panel & push breakers for microwave & AC, all the way off hard, then try to reset it & tell me what happens.

Dirty coils might be your problem. You might have a refrigerant problem as well. Try cleaning it first then have a tech put gages on it. Doesn't sound too serious

I would check the thermostat based on what you said it could be out of calibration

I don't think you need a new one just a good cleaning and service. The unit has a liquid high temperature line near the compressor with a fan blowing outside air across it this coil gets clogged over time with air-borne dirt and pollen and leaves and such and must be cleaned regularly or the unit will be unable to remove the heat from the coil and during the peak demand (3pm) the circuits that protect the compressor and the trailer wiring from being overloaded and burning or melting will trip. From what you have described it sounds like the RV is working as it should with a condenser coil that needs to be cleaned. GL and happy camping!
P.S. I've only serviced the occasional RV unit but in those cases I laid a piece of plywood on top of the Rv for work platform removed the retaining screws from the top cover and used a spray bottle with a good heavy foaming cleaner a shop-vac and a brush to get the job done.