Have you opened it and tried cleaning the inside of it ? Poking around inside may help lead you/us to finding why it's constantly running.Clean all the dust bunny's out and give it a good once over.Check all the obvious wires and connections.If you notice icing starting from a certain area like a valve or evaporater take a picture if you have a camera and post it.Make sure the fans are working and nothing is plugged with dust.I am licensed but don't work on appliances.I work on truck and trailer refrigeration units.
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