When the compressor tries to come on, why does it click and hum, then clicks off?
Two causes for that situation. The compressor has a start relay and a overload mounted on the 3 prongs. When the relay/overload is bad, compressor will kick on, hum, then a click sound. The click is the overload. Or, the compressor is drawing too much power and the compressor is bad. 90% of time it's the relay/overload but you need to check and make sure fan is running by compressor and coils underneath are not clogged up. Poor air flow around compressor can cause overload to go bad.
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