If you are changing applications or setting up a new machine you may see the message "Raise Tap" or "Lower Tap" on the display. The machine has determined either the set point you are asking for cannot be reached on the current Tap, or it's unsafe to operate on the current Tap. Your owners manual provides instructions on changing Taps, it's crucial that you follow these instructions. REMEMBER: If you change the operating Tap via the touchpad you MUST also physically change the Tap setting on the rear of the heat station. This is CRITICAL. There is a guide on the rear of the heat station that will direct you to the proper mechanical connections for the Tap you've selected. ANY, and EVERY, time you change Taps you must make changes in BOTH places. Otherwise the machine will not operate properly.