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Is there any way to tell which board is bad? When I fired up my tub this year, it powered up and worked once. Now it is not powering up. I tried resetting the breaker etc and it still would not power up. A week later I tried it again and it powered up but it quit after a little while and it has remained dead. I confirmed I do have 220 coming in on the heater relay board with appeared to feed the main board. Thanks for your help. Mark