How do I enable High Altitude mode?
Press and hold the POD and CARAFE buttons simultaneously for 3 seconds to enable High Altitude mode. When enabled, a mountain icon will appear on the display screen. This setting ensures your coffee maker works properly at higher altitudes (1,500 metres/5,000 feet). (Page 3)
From the official Keurig K-Duo Dual Brew Coffee Maker manual, page 3
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