Not enough power is the most probable cause .
A 15 amp outlet combined with an extension cord ( you didn't mention cord type or length ) but you're probably trying to run the A/C with way less than the unit's required power for start up ; AND risking damage to the unit .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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