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The thermostat is a basic switching station. One hot wire, usually red in color is switched to various circuits to turn on the following components; indoor fan, compressor, reversing valve, supplementary heat strips. Usually if your thermostat can still turn on any of these items your thermostat is still good(meaning other components or internal swiches are failing). There are simple tests that can be made to determine the problem but usually is left to a technician. Simple switching problems can turn into hundreds of dollars in damage.

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17y ago

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