Is your plug a GFI type? It's built in my old A7.. Should protect from internal shorts.
Press the Test button to make sure it's working..
Could it have been a normal static discharge? Because that tubing should be grounded via the 3pin outlet.
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My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
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