Happened to me in Canada several years ago before I bought a good surge protector. Often happens when the voltage drops and the A/C unit is trying to pull enough amps to run. The weak point is usually where the cord comes into the unit. It can heat up and melt it. Happened in my boat in the Bahamas one time too. Notoriously bad power in the Bahamas. A surge good protecter will cut you off before the cord or your A/C is damaged. A good investment.
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