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The audio plug, for like a stereo? Seem to me that would be 12v and no way run a 110v circ pump. Makes no sense, unless the transformer for the stereo plugs into it that, then drops it down from 110 to 12v for the stereo?
Are you sure the heater has always been on with all three pumps running.
if the circ pump was running it should heat the temp to what ever temp you set. It doesn't just run all 3 pumps at the same time by itself.
Nope. It has LEDs built in it but we typically don't use them. No other accessories. Just the jet pumps and circ. Do you think the main board could be damaged by the low voltage deal?
Everything (mostly) has worked for five years with this tub. It's always heated while running all three jet pumps. The circ cycle turns on something like 8 times in a 24 hour period (I think). And, the jet pumps turn on a few times in the 24 hour period too. The only exception was when the circ pump plugged into the stereo plug and it wouldn't run correctly. It's just odd to me that it's been fine that whole time, then they hook something up incorrectly and all the sudden, the board is going bad. It also doens't look great that when the company checked their paperwork, it was documented that the pump was hooked up correctly...after the second guy came out and told us it was wrong. He logged it on his paperwork, but somehow that got changed after he left our house.