Troubleshooting FL1 or Flashing FLO Error Codes For Spas With Circulation Pumps

The flow errors FL1 and FLO are the most common error codes we get calls about. As people read through their owners manual, it is easy for people to quickly come to the conclusion that the first thing they need to replace is their flow switch. While that may certainly be the case, it may also not be the root cause of the issue. So, here are the steps you want to follow to determine what is causing your issue (please note- Be safe. If you arent comfortable with testing electrical current, please call a local technician):

1. First thing to do is remove your filter(s). If the error goes away, then it would be a good idea to replace those filters. While it is not a 100% guarantee this is your issue, it could be a contributing factor.

2. Next thing to do is open your cabinet and take a look at your flow switch. If water is properly flowing, then you should be able to see that that the paddle inside the flow switch is firmly pressed up against the vertical reed.If its fluttering, there may be a partial obstruction (i.e. kinked plumbing line, organic build up, partially clogged filter, etc). If it's completely open, and you have verified there are no water flow obstructions, then it is time to make sure your circulation pump is receiving power. 

3. First verify your spa is receiving the specified incoming voltage into the circuit board as well as out of the circuit board to the transformer. Also, check all fuses for continuity. Next, check the service tag on the side of your circulation pump. This will tell you approximately what voltage your circulation pump should be getting. If your pump is receiving the specified voltage but is not running, then replace the circulation pump. If is not receiving voltage but it should be, then you likely have a circuit board issue. Now, if your circ pump is running and the flow switch appears physically in the closed position, then test the flow switch.

4. To test the flow switch, set your meter to ohm's. If your flow switch appears visually closed, and you test across those two wires, your should be getting roughly 0 ohm's or no resistance. If you are showing any other results, then you most likely need to replace the flow switch. 

5. Lastly, if your circulation pump is running like it should be, and your flow switch is testing as it should be, then you have a rare instance where your circuit board is misreading the information sent to it by the flow switch and your circuit board will need replaced.