Why my 3M HCD2 water dispenser cold "BLUE" LED light is turned off?
# Please do not panic!
Because you accidentally switched off the compressor.
How to to toggle ON/OFF for the cold water?
1. Press n hold for 5 seconds, at the right side touch panel button to toggle ON / OFF for cold water.
Press n hold for:
2 seconds for auto dispensing,
"5 seconds for toggle on/off for cold water",
10 seconds to reset the sound