SOURCE: heater pump does not turn on Jacuzzi hot tub 325
Heater operates seperate from pumps. Do the pumps come on? Pressure/flow switch turns on heater, so if the pumps work, there is an issue with the heater element, the flow switch will usually prevent the spa from running at all and there will be an error code on the control panel.
SOURCE: jacuzzi whirlpool hot tub, flashes Fl-1 has new filters,
Sounds like a bad heating element. This is located in a stainless steel tube under or around the main control box behind the cover around the tub. It is not hard to replace but should be done by a pro. The part is avaliable online.
SOURCE: Jacuzzi hot tub model J-300 series with an FL-1
A flashing “FL1” display means the flow switch is
malfunctioning open, the filter cartridge is excessively
dirty or an “air lock” condition has occurred at the
circulation pump intake.
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