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Old 06-29-2022, 12:36 PM   #1
Junior Member
State: Arkansas
Posts: 3
THOR #26514
Airconditioner not working on shore power

Has anyone experienced the AC compressors not working on shore power. Works fine on generator but not shore power. Surge guard says power is ok and not running anything else. 2022 Magnitude XG32.. TIA

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Old 06-29-2022, 12:38 PM   #2
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Brand: Thor Motor Coach
Model: Freedom Traveller A27
State: North Carolina
Posts: 2,440
THOR #17765
Are you plugged into 50, 30, or 20 amp? Using dog one adaptor of any sort? What brand and size AC? Your info is a little vague.
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Old 06-29-2022, 01:11 PM   #3
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,340
THOR #7035
Do the fans in the A/Cs run? How about the microwave? Where is the "Surge guard" installed, internal or external?
Ted & Melinda
2016 ACE 27.1
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Old 06-29-2022, 02:28 PM   #4
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Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,154
THOR #12751
I've got a '20 Magnitude SV34. You have two Coleman Mach 13,500 BTU A/C units. If they both work on generator power, there is no reason for them not to work on shore power unless you have an issue with the Transfer Switch or an issue from the 50A cord and wiring to the Transfer Switch.

If both A/C's are not working on shore power, check to make sure the microwave / convection oven actually is working on shore power. If not, then you need to start testing from 50A cable (plug it in and get your meter out and check that you have 120V on each leg). If power is getting through the cable, then you need to check to see if power is getting to the transfer switch and then out of the transfer switch on shore power.

Now if your fans run but the compressors won't start, it could be an issue with the FireFly System. The main G7 control board in the FireFly System needed replaced in my coach. I would have situations where the compressors would run and the fans would not. Or the fan would run and compressors would not. If I would power-cycle the 12V to reboot the system, it would start working properly but the same problems would happen again.
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