If I did the three seconds, it just blinked like it acknowledged my input but it made no difference. Somewhere it said, turn off the power and press lungo for 5 seconds. No power switch on mine.

I unplugged it for 10ish. Pressed the lungo for 10ish seconds with it unplugged. Im guessing maybe that was to clear the capacitors? Not an electrical guy, but I have had to do that on computers to help reset things.

I plugged it in while holding the lungo button still and waited for 6 more seconds. It seemed to response and started to heat up normally. I hope this helps someone!