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It is most likely a week wire connection or a defective electronic board with a bad weld, inspect carefully all wiring connections..
Hi, I would be more than happy to help you diagnose the issue if you have a voltmeter and feel comfortable checking 24v. I agree with the previous tech that it is most likely a poor wiring connection or a defective board. However, through careful use of a voltmeter we can eliminate other possible causes and verify the board is the issue. Thanks.