Outdoor unit won't come on:
This is a very common and usually simple problem, whether it is an air conditioner or a heat pump. Many times the service technician is dispatched only to find a simple problem that the homeowner could have fixed himself. A list of possible causes:
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Thermostat not set properly
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Emergency or shut-off switch turned off (usually a red button around copper line or line coming into unit)
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Blown fuse in panel box (replace both fuses)
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Circuit breaker tripped or off- (sometimes a breaker will trip but it won't move always turn off and back on to reset even if looks on)
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Outdoor disconnect turned off- (some have an internal pull-out plug)
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Condensate pump or safety switch opened at blower or furnace unit (check pump, usually located near indoor unit)
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Unit "locked-out"- (reset by turning off then turning back on)
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Faulty thermostat
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Faulty contactor (ants sometimes like to live here)
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Faulty time-delay relay
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Faulty thermostat wire (sometimes damaged by animal or lawn mower)
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Safety device tripped - (low pressure, low temp, high pressure, high temp...)
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Faulty control module
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