Bath tub spa will not shut off
If you haven't done this already.
I would search your breaker panel for a circut breaker titled jacuzzi tub (or something to that effect), and if it is not listed I would get someone to monitor when the tub shuts off, while you flip each breaker off, one at a time so as to determine which breaker it is and then immediately title it.
Next, an access panel to the tubs motor should be installed. After access is gained, inspect the pumps receptacle and if it is not GFIC protected I would return to the breaker panel, it may have a GFIC breaker. If neither are the case, then have this issue repaired
The button on your jacuzzi is air actuated with a flexible air line that connects to the actual switch, it may have broken or however became disconnected.
Any questions, feel free...
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