How to fix a hot tub Flo error code
The hot tub FLO, FL1 or FL2 error codes for a Balboa spa control system suggest that there is a problem with the water flow through your hot tub heater.
Hot tub control systems (also known as spa packs) are designed with built-in sensors or a pressure switch to protect the hot tub heater from burning out. The topside control (sometimes called the keypad) can display different error codes to help identify what can be causing the problem.
What is the FLO error in a hot tub?
The Balboa M7 systems have digital 2 sensors on each end of the heater tube that are connected to circuit board which monitor water pressure and flow rate through the heater. On the older systems there is a device called a pressure switch that does the same thing but mechanically instead of digitally.
What causes a FLO error code in a spa?
A FLO error code can be displayed in different versions depending on the screen type in the spas topside control or keypad. Common variations are FLO, FL, FL1, PS, 3 flashing dots, DRY, or DR.
There are a few common issues that can cause FLO errors in hot tubs:
- Low water level in the hot tub,
- Dirty filters,
- Malfunctioning or clogged circulation pump if the spa is equipped with one,
- Bad sensors or pressure switch
One of the most common issues is a dirty filter where the time has not been taken to clean the filter cartridges often enough so they get clogged and restrict the flow.
Another common issue is low water level, when the there are 2-3 people in the spa water can get splashed out and displaced then when everyone gets out the water level drops below the filter and the pump start sucking in air. This can trigger an FLO error code.
Troubleshooting a FLO error
So you go out ready to enjoy your hot tub, lift the cover and discover the water temperature way lower then what you like it at and the topside control is flashing the FLO error. Well what to do now? Below are a few simple steps that should help narrow down the issue.
Step 1.
Check the water level to ensure its at the correct level, if too low turn off the GFCI breaker, top up the spa to where the water level should be then turn the breaker back on.
Step 2.
If the water level is at the correct level then next you’ll want to direct your attention to the filter, turn the GFCI breaker off, and remove the filter cartridge then turn the breaker back on and allow the system to fully boot up and run for about 5 minutes.
This process will clear the error code from the firmware on the circuit board and if the filters were restricting the flow your hot tub should now function normally and start heating. If the spa is working properly then soaking the filter in cleaning solution and rinsing it thoroughly would be required or if it’s older replacing it with a new one would be a good idea.
Step 3.
If your hot tub is equipped with a separate small circulation pump check to ensure the pumps is running properly. If the circulation pump is bad you usually hear it making a louder whining noise when running. When the circulation pump starts getting loud it could slow down from the bearings starting to go bad due to the age or if the shaft seal has been leaking for a while it will reduce the flow rate of the pump. The small pumps can also quit working and have no flow at all.
If these 3 steps did not solve the FLO error and heating issue then it would be beneficial to call your local service technician or the dealer the spa was purchased at, as further troubleshooting by an experienced technician is required to identify the issue.