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Model number was not included so I have to provide general info for now and when you are able to provide I can give more specific info however it will still be related.
To start you would want to use a voltmeter to test the power switch the the demand switch, the power switch you should get power in and out when on and have been known to fail like any switch. Your other switch will be the same for testing in terms of power in and out during demand. You would also want to test the reset as well to be sure it is functioning.
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