When we plugged up our leisure hot tub it smelled like plastic wires burning but we did not find anything burning. on our proshield control panal there is a plug missing it is the third one down on the left side. what is this plug for and is it needed. also we bought the hot tub used. also can we get troubleshooting advice for the proshield control panal and for the hayward pump. all advice will be helpfull. thank you
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