2018 Winnebago Vista 29VE Coleman Mach Not working

[bigdog70]

I think I know what my issue is but was looking for concurrence.
I was in Nevada with my 2018 Winnebago Vista 29VE, 30 amp, at a friends. It was very hot, 110 degrees. I plugged into his garage 115v, 20 amp outlet. Turned on my AC, Coleman Mach with a remote thermostat. It ran for several minutes before tripping the garage circuit breaker. I turned off my AC and switched the frig over to gas only to get it off the circuit. Reset the breaker and again turned on my AC. Several minutes later it tripped the breaker again. This time I turned off my AC and plugged directly into my generator outlet and started my generator. AC will not start. I left the 115v power off for several days and ran the generator and still no AC. Tried 30 amp shore power at an RV park and still AC will not kick on.
Coach 30 amp and 20 amp CB not tripped and working.
12v Thermostat, ICM AP7862-4, fuse good and calls for AC.
When AC selected the Thermostat calls for AC and has power at Red (W1), yellow (W5) and gray (W3). I can hear a click at the roof AC control box which I assume means power is getting to the AC Control box.
Select heat and the heater and blower works.
Select fan and the thermostat calls for it but the fan (AC) does not work.
Reading the AirXcel owners manual it states that "If repeated trips of the high pressure switch lock out occurs, then you must have the unit serviced by a qualified technician."
I am thinking this may have happened.
I am hoping I did not lock up the compressor.
I have a mechanical/electrical background, aircraft, and some heating and cooling working knowledge. I like most of you love to troubleshoot and DYI.
Just not familiar on these roof top units and what a qualified service technician would do to get the unit working.
Does anyone out there know? Could it be some simple reset I can do?

[TXiceman]

Have you checked the A/C compressor to see if the motor shorted or burned out. It is possible that you damaged the compressor.

Any time you run an RV from a house 20 amp circuit, you have to make sure the Fridge and water heater are on gas and not electric. Also must make sure there are no other house loads on the 20 amp circuit.

It will take some trouble shooting to see where the problem lies. There should be a wring diagram for the unit in the manual and/or under the cover.

Ken

The compressor in the A/C also has a Klixon temperature sensor that will shut off the compressor.

[bigdog70]

Thanks, Ken
I'll have to get up on the roof later tonight after it cools down here in the California High Desert to check the compressor motor and the temp sensor.

[WalkTheWalk]

Hey BigDog: We did the very same thing years ago. We ran our like new 2005 Wildwood 37BHS, with 30Amp service, using one of those cursed Camco 15-30 amp adapters. They should be outlawed.

Just like you we ran the AC and other appliances and then the Dometic AC unit quit. I want to say it blew a start or run cap, but I had to get a mobile tech to come out, as this trailer was parked in the deep woods.

After that, I paid an electrician to install a 30 Amp RV power pole and use a Progressive Electronics surge protector, too.

[bigdog70]

WalkTheWalk, Thanks for your input.

Problem solved with the excellent support of a Coleman (Airxcel) service technician. Methodically we confirmed correct thermostat voltages at the AC control box and all checked good. Then removed the control box and cover to check the 115V input voltage and immediately I saw that the white power wire yellow twist cap was burnt indicating a bad connection and electrical short. Also all three, power, ground, neutral wires, of the Romex wires at the twist caps were way too long and ~1/2" of non-insolated solid core wire was protruding outside of the twist caps setting up for an electrical disaster. Anyway I cleaned up the installation and installed new twist caps and the system works as it should.

I am not happy with Winnebago and their electrical technicians since this is the second electrical issue I have had that was attributed to a loose connection and poor installation. Where in their quality control?

Our first incident was with the chassis AC and a loose connector-burnt in the dash behind the AC & AC blower controls. Again this could have been an ugly fire behind the dash.

Anyway, Thanks for everyone inputs.

[bigdog70]

Seeing if I figured out how to add photos.

Photo of the burnt yellow twist cap and exposed power wires.
https://www.irv2.com/attachments/pho...ical_Short.jpg