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Jacuzzi z145

I have just purchased a used Jacuzzi hot tub and it is the possibly infamous z145 (as my recent research is telling me), it is the first hot tub I have ever owned and I have no instructions for it or any other info for that matter. The problem that I am having is every so often when i go to get in the water is only luke warm and the red light is flashing on the control panel. When I push the on button the jetts come on and the tub functions fine. it warms up quick and will be fine for a while, till it happens again days later. All I have for controls is the one knob for temp and one push button for jets. I would appreciate any info on this, or where I would get some instructions. Thanks


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