‘FL’ Message on a hot tub

Why does the panel display “FL” constantly and nothing works?

  • This is an indication of a pressure switch stuck in the closed position.
  • Check the slice valves and verify that they are open.
  • Make sure the pressure switch wire is connected to the proper circuit board connector.
  • Disconnect the pressure switch wire from the circuit board.
  • If the hot tub operates normally, then recalibrate the pressure switch.
  • If the pressure switch cannot be recalibrated then replace it.
  • If the problem continues after disconnecting the pressure switch wire from the circuit board, replace the board.

Why does the panel display “FL” alternating with current temperature?

  • This is an indication of an open pressure switch.
  • Check the water level.
  • Check for blockage in the filter cartridge, skimmer basket and pump intake fittings.
  • Check the slice valves and verify that they are open.
  • Make sure the pump is primed and pumping properly.
  • Make sure the pressure switch wire is connected to the proper circuit board connector.
  • Check the pressure switch wires for cuts.
  • Recalibrate the pressure switch.
  • If the pressure switch cannot be recalibrated, replace it.

This is NOT intended as a service guide or a means for you,
as the consumer, to service your equipment in any way. this information is being provided for informational purposes only. Any and all service should be performed by a licensed spa technician.