The red toggle switch located on the rear panel of a Primo hot and cold water dispenser controls the electrical power supply to the internal hot water heating tank. Flipping the top side of this red switch inward turns the heating function on, allowing the internal heating element to warm water up to piping hot temperatures. Flipping the switch off disables the heating tank entirely, allowing you to save electricity or dispense room-temperature water from the hot spigot if you do not require heated water. You can troubleshoot heating status easily by observing indicator lights. You can verify that your switch setting is correct when turning the red switch on causes the heating indicator light to activate and deliver hot water after a fifteen-minute heating cycle.
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