Welcome to our forum.
Ok, we have been using our new HS/Tiger River Caspian hot tub for just over two weeks now and absolutely love it! Only problem is that tonight after we got out and I turned the thermostat back down to 102 (we usually leave it set at 102 but I turned it up to 104 tonight before we got in to see if if would get any hotter), this weird chirping/whirring/squealing sort of noise started coming from behind the main panel.
this can be caused by cavitation.
Then the Russian tub will hear it coming.