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I have a master spa with an issue of the 2 speed motor humming when the high speed is selected. I replaced the motor, problem is unchanged. Any ideas on what to check? I have been thi king relay but I hear one click wheb the button is pushed

I am having an issue with high speed on a 2 speed pump. It hums then trips a breaker when high speed is selected. Low speed works fine and motor is new. I suspect the relay but don't know how to figure out which o e on the circuit board. Is a 2009 master spa legacy.Any help would be appreciated.