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In many spa jacuzzi hot tub system designs, FL2 usually represents "Flow 2 Error," or a secondary flow error message. Its core meaning is: The spa jacuzzi tub detects an abnormal water flow in the circulation system or an inconsistent flow switch state.

Most spa jacuzzi tubs have a preset upper temperature limit, typically between 100°F and 104°F (approximately 37.7°C–40°C), with 103°F being the most common sustained water temperature. Because: 1. Excessively high water temperatures can pose safety risks 2. Controller firmware sets a limit

Below the outer side panel of the spa jacuzzi hot tub Many hot tubs have a product nameplate or label affixed below the outer panel. If your spa jacuzzi hot tub has an openable side panel, this is usually the easiest place to find the model number.

Center of the bathtub bottom This is the most common drainage configuration. Spa whirlpool bathtubs typically feature a slightly sloping bottom, allowing water to flow naturally towards the center and drain from a central drain.

The location of the heater in a spa jacuzzi tub varies depending on the brand and model, but generally, it's installed at the bottom or beside the tub, near the water circulation system. These locations ensure effective heat exchange between the heater and the water flow, thus heating the water.