If you're getting error codes or blinking dots:
There are several different error codes that are used by many different manufacturers. The predominant manufacturers are Balboa, Gecko and Hydro Quip. The error code that we are going to look at here is "FLO" or 3 blinking dots. Both mean the same thing and will be troubleshot the same.
"FLO", "FL" and 3 blinking dots mean the same thing - the water flow through the heater is inadequate or the pressure switch is mis-calibrated and/or possibly defective. Before we troubleshoot this error code here are a few possible causes: Dirty filter (remove it) Too many jets closed off or all jets not installed Debris wrapped around the pump impeller Defective pressure switch Defective pressure switch cable Defective circuit board Before proceeding make absolutely sure that the pump which circulates water through the heater is passing water through the heater and also make sure you see water movement in the spa! If you don't confirm water is moving in the hot tub and through the heater do not proceed with the next step as in doing so may burn out the heating element. To check to see if the pressure switch is defective or mis-calibrated, please do the following: Power down the circuit board. Unplug the pressure switch cable from the circuit board, thus revealing two pins. Power up the system. As soon as the low/filter pump turns on, jump the two pressure switch pins on the board with alligator clips. Don't worry, you will not get shocked as the pins are low voltage. Did the error code go away? If so, the pressure switch or the pressure switch cable is defective and should be replaced. If the code did not go away then the circuit board will need to be replaced. Back to "if the code did go away after jumping the two pins on the board" - There is a possibility that the pressure switch simply needs to be calibrated. To do this, either turn the wheel or the screwdriver slot on the pressure switch counter-clockwise one full turn (two at the most). If this does not make the code go away, then send the board in for repair or replace it. See complete list of error codes here. More information regarding pressure switch adjustment.
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