Air conditioner on pop up camper

bad thermostat or not communicating with a/c board.

There is ice forming on the evaporator coils. This is either from a low freon charge or a leak in the seals or windows and doors. Could also be that the drains are not working and water is building up and freezing

Hi, this does sound as though the compressor is off. Go on top , pull the cover off and see. Turn the control to cool to see if all is running on top. You should have a disconnect at the unit. If its off, check for any blown fuses, or power to the system.
Shastalaker7 A/C Contractor

many, many. Is the outside unit running? If it is, is the compressor running? Feel the refrigerant lines leaving the unit. Little one should be warm. Big one should be cold, probably sweating.

if you hear the compressor turning on,no heat, the coolant has leaked out. if the compressor doesnt turn on, its a control issue.

Actually, the dealer is somewhat correct. In the hotter months of the summer, the rooftop units have a tendency to freeze up if not run on high cool due to the lack of air movement across the evaporator. If the unit fines on High/Cool, then run it in that mode but adjust the thermostat.

It should not however, cycle on and off that fast unless you have a bad freeze switch or the incoming AC is too low. If during that 8-10 seconds, the air begins to get cold and then it shuts off, then I would say you have a bad freeze switch. If it runs fine on high, but shuts off in low, I would say it is a lack of air movement.

Hope this helps,

Jeff

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Isolate the thermostat sensor. Hold it with your hand and see if it comes on and stays on. If so, replace the thermostat.

Is compressor running. If the fan runs and the compressor runs. You are out of refrigerant or the compressor has bad valves. Please leave feedback. Rusty

sounds like the compressor in your air conditioner has a broken spring in it,you can not take the compressor apart to fix,has to be replaced(cashy).I assume your camper is shaking,and the noise only happens when you turn on the air.