A/C Fan working but not cooling

[JBRV2020]

I did a search but couldn't find what I was looking for. Hopefully you folks can help. My Colman Mach 15's fan will run on low and high. 330 watts and 630 watts respectively. When I switch to Cool low or hi same wattage as if running fan alone. I don't hear it try and kick on the AC compressor at all. Unit is only 15 months old on a 2021 25G that we picked up Dec '20. Front AC works great. I'm trying to avoid taking it into a dealer and not seeing the camper again for 2 months. Any suggestions?

[Jlawles2]

See if you can find a Coleman certified mobil tec. You will be responsible for the initial call out fee and the labor most likely, but you will not be put on the 2 -3 month waiting list to get looked at and Coleman will most likely ship the replacement unit straight to the tec.

[Country Campers]

Is the thermostat set low enough for the compressor to kick on? I know that is obvious but had to ask.

Brian

[JBRV2020]

Yes the thermostat is set as low as it will go.

[Country Campers]

Air Conditioner Troubleshooting Videos - Grand Design Owners Forums (gdrvowners.com)

This is a link to our Reference Section in HVAC, there are a couple videos that may be helpful, sorry my first post was not helpful.

Brian

[ncitro]

JBRV2020 If I remember my Coleman from when I installed it, the thermostat had separate wires for each function similar to a home thermostat. First thing I would check is if all the wires are connected when you pull it off the wall, if memory serves this is the yellow wire for the compressor. After that if you have a meter and know how to use it, see if the thermostat is sending a signal on the compressor wire. The thermostat is basically a glorified switch. If the thermostat is calling for cooling you should have 12V between ground and the compressor wire and either the fan high or low (depending what is selected) wire. I believe the ground should be blue, so when the thermostat is set to cool, and is set low enough to run you should see 12v between the blue and yellow wire. If you do not have that, its probably the thermostat, if you do then you move into troubleshooting the connections in the ceiling.