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I have the CTEK version of the Porsche battery maintainer. I'm going to guess that the power socket you have your charger plugged into has a GFI outlet somewhere else on the same circuit and the GFI has tripped. I just verified if I unplug my CTEK from power, but leave it plugged into the cigarette lighter in the car, I can cycle the power button on the CTEK through the motorcycle, car, optima battery and snowflake positions. I actually had the same issue as you a few years ago. I thought the CTEK had died and bought another on Amazon, only to have the same issue. I learned there was a basement outlet with a GFI on the same circuit as my garage outlet and it had tripped. I returned the new maintainer and the original one is still going strong for 17 years now!
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Current: 2022 718 Cayman GT4, PDK bone stock (the dark side).
Former: 2003 S, 3.6 LN Nickies, ARP rod bolts, under-drive pulley, Fabspeed sport headers, Softronic tune, 987 airbox 987 motor mount, Function-First Sport motor mount insert, Ben's short shifter, Nine8Six projector headlights & center caps, ROW M030, stainless flexible brake lines, B-K rollbar extension & fire extinguisher mount, hardtop
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