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A/C Troubleshooting Help? Coleman Mach 48000

dwightmccann
Explorer
Explorer
My Coleman Mach 48000 Model: 48207C966 controlled by Atwood 2H2C thermostat air conditioning stopped working between uses. New in 2014, so just out of warranty. The furnace works fine. The display on the thermostat works fine, showing all settings. When I turn it on A/C manual, either high or low, or automatic, the A/C does nothing.

I have pulled off the thermo cover and inspected both sides of the circuit board, which looks fine. My son pulled the cover off the A/C and said everything looked fine ... no rats or mice biting through wires!

I am not very mechanical and have not found any sort of troubleshooting guide online or in my paper manuals. Any guidance would be appreciated.
Dwight

2015 White Silverado 3500HD Crew Cab 4x4 Diesel LTZ Dually
2014 Lance 1172 Camper - with Everything
http://www.DwightMcCann.com
8 REPLIES 8

dwightmccann
Explorer
Explorer
ken56 wrote:
Is it on a GFCI circuit?
I don't think so. It is on a 20 amp circuit breaker.
Dwight

2015 White Silverado 3500HD Crew Cab 4x4 Diesel LTZ Dually
2014 Lance 1172 Camper - with Everything
http://www.DwightMcCann.com

dwightmccann
Explorer
Explorer
newman fulltimer wrote:
check the 110 connection at the ac and check ro see if a sirt dobber nest has the outside fan locked up


Yup, I think that's next.
Dwight

2015 White Silverado 3500HD Crew Cab 4x4 Diesel LTZ Dually
2014 Lance 1172 Camper - with Everything
http://www.DwightMcCann.com

ken56
Explorer
Explorer
Is it on a GFCI circuit?

newman_fulltime
Explorer II
Explorer II
check the 110 connection at the ac and check ro see if a sirt dobber nest has the outside fan locked up

dwightmccann
Explorer
Explorer
sch911 wrote:
And you're plugged into 30A shore power? If so check the breaker panel to see if the A/C breaker is ok.


Yes, was plugged into 30 amps when discovered. The circuit breaker for the A/C appears OK and has been reset several times and the 15 amp fuse for the thermostat has been checked (but, of course, it is clearly working ... runs furnace and shows settings in readout.) Have also tried running it with generator, no change.
Dwight

2015 White Silverado 3500HD Crew Cab 4x4 Diesel LTZ Dually
2014 Lance 1172 Camper - with Everything
http://www.DwightMcCann.com

dwightmccann
Explorer
Explorer
MEXICOWANDERER wrote:
I am assuming the A/C control thermostat is showing the unit "should be" cooling but of course, isn't?


Correct. Among other settings, "Hi" in 'Cool' position.
Dwight

2015 White Silverado 3500HD Crew Cab 4x4 Diesel LTZ Dually
2014 Lance 1172 Camper - with Everything
http://www.DwightMcCann.com

MEXICOWANDERER
Explorer
Explorer
I am assuming the A/C control thermostat is showing the unit "should be" cooling but of course, isn't?

sch911
Explorer
Explorer
And you're plugged into 30A shore power? If so check the breaker panel to see if the A/C breaker is ok.
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