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hi i am dan i can help you with this. that will definatley be a high pressure switch on the unit. the only way to determine the cause would be with a manifold gauge. but most likely you do not need a new unit. one possibility is a dirty condensor coil. it needs to be cleaned out with a coil cleaner and then rinsed out from the inside out. another possibility is the fan is not working. or there is a restriction of refrigerant flow somewhere in the system.
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