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Hello, if you have the full model number of the cooler and if its not too old i can look up the wiring diagram and coach you on how to do the diagnosis.
Or if you can find the systems wiring diagram take a close up, very very well focused and well lit picture of it and send it to me...Use the paper clip icon at the right end of your tool bar for that, or the 'attach files' link to the left of your send button.
We can go from there.
Good work, stay in touch if needed.