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dwightmccann's avatar
dwightmccann
Explorer
Jul 14, 2017

A/C Troubleshooting Help? Coleman Mach 48000

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.
  • dwightmccann's avatar
    dwightmccann
    Explorer
    Jul 15, 2017
    ken56 wrote:
    Is it on a GFCI circuit?
    I don't think so. It is on a 20 amp circuit breaker.
  • dwightmccann's avatar
    dwightmccann
    Explorer
    Jul 15, 2017
    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.
  • newman_fulltime's avatar
    newman_fulltime
    Explorer II
    Jul 15, 2017
    check the 110 connection at the ac and check ro see if a sirt dobber nest has the outside fan locked up
  • dwightmccann's avatar
    dwightmccann
    Explorer
    Jul 14, 2017
    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.
  • dwightmccann's avatar
    dwightmccann
    Explorer
    Jul 14, 2017
    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.
  • MEXICOWANDERER's avatar
    MEXICOWANDERER
    Explorer
    Jul 14, 2017
    I am assuming the A/C control thermostat is showing the unit "should be" cooling but of course, isn't?
  • sch911's avatar
    sch911
    Explorer
    Jul 14, 2017
    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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