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What does the EM HT switch do?

April 26, 2017em ht Switch

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What does the EM HT switch do?

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“EM HT” stands for “emergency heat.” When this switch is in the on position the heat pump (the unit outdoors) is turned off and the electrical supplemental heater becomes the sole source of heat. This switch is used only if your outdoor unit (the heat pump) is not working or needs service. The red EM HT heat light or icon on your thermostat will light when this switch is on.