Duplo ULTRA 200PRO - 5.15 Viewing UV Lamp Hours

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5.15 View the Lamp Hour
Press and hold the button whilst switching on the main power. Keep holding
the button for 5 more seconds to get into service mode, the display will
change to “U-0X” (0X is revision of the firmware), and then press button
briefly to set the new lamp hour to “0000”.