I've got am JTS compressor (I think maybe a rebrand CS3) and the inverter fan stays on with the switch off. This happened after a power outage. I just replaced it with a CS-4i and I fired it up for the first time this morning and it does the same thing. Invertor fan comes on and stays on until I unplug the cord. What am I doing wrong now.
 
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GX saves money by using the the plug as an "on-off" switch. Personally, I believe this practice is hard on the electronics because I believe that the ground should always be securely established before the power supply is energized. Early on, I had some issues with the power supply switching off at odd times. I purchased and installed an in-line on-off switch and the power supply has worked flawlessly since.

JackHughs