How to troubleshoot FL error in a Jacuzzi® Spa

Quickly troubleshoot an FL fault in your Jacuzzi spa with our guide. Identify causes and follow step-by-step fixes to restore your spa to good working condition.

How to troubleshoot FL error in a Jacuzzi® Spa

Spa World has been a trusted spa retailer since 1985. We are known for our expert advice and resources on spa maintenance and ownership.

This guide explains what the FL error in Jacuzzi® Spas means, the function of the flow sensor, and how to troubleshoot the issue for smooth spa operation.

What does an FL fault indicate in a Jacuzzi® spa?

An FL fault in a Jacuzzi® spa signifies an issue with the flow sensor. This fault indicates that the flow sensor cannot detect proper water flow through the system, which may lead to the deactivation of critical components such as the heater and the circulation pump.

Proper water flow is crucial for the efficient operation of these components, and any interruption can affect the overall functionality of the spa. The FL fault is an alert to prompt immediate troubleshooting to address the underlying issue.

What is the purpose of a flow sensor in a Jacuzzi® spa?

The flow sensor in a Jacuzzi®spa is a safety feature designed to monitor the water flow within the system.

Jacuzzi Flow Sensor

Its primary function is to ensure that water is moving correctly through the spa's components, particularly the heater. If the flow sensor detects insufficient flow, it will trigger the FL fault and consequently shut off the heater and possibly the circulation pump.

This precaution prevents potential damage to the spa's components and ensures user safety by avoiding overheating or damage due to lack of water flow.

Watch: Troubleshooting Jacuzzi® open flow sensor error

What are the steps to troubleshoot an FL fault in a Jacuzzi® spa?

To troubleshoot an FL fault in a Jacuzzi spa, follow these steps:

Step 1: Check the Water Level

Checking water level in a Jacuzzi Spa

Ensure that the water level is between the top jet and the headrest. This optimal water level is crucial for proper spa operation.

Step 2: Inspect and Clean Filters

Jacuzzi dirty filters
  • Remove the filter housing.
  • Extract the filter by grabbing, turning, and pulling it out.
  • Clean the filter thoroughly or replace it if necessary. Dirty filters can significantly impact water flow.

Click the appropriate button below to find out how to clean your spa filters for your specific Jacuzzi® Spa model.

Step 3: Verify Water Movement and Bubbles

Spa water movement

Ensure there is water movement and bubbles in the spa to confirm that the circulation pump is operational. If there is proper water movement, the issue likely lies elsewhere.

Step 4: Purge the “air lock” from the circulation pump

An airlock is a bubble of air trapped in the pump or plumbing. This air bubble prevents the circulation pump from pumping water and causes the spa controller to trip off. To purge the airlock from the circulation pump, please follow the steps below:

  • Hold your garden hose over the filter cartridge wall fitting while using a rag to seal around the hose end.
  • Ask a helper to turn on the water for 30 seconds, then turn off.
  • Reinstall the filter cartridge and check the spa to see if the error has been resolved.

Step 5: Contact a Spa Technician

If the problem persists, please reach out to your local spa technician for further diagnosis and repair.

How can dirty filters affect the flow in a spa pool?

Dirty filters can severely impact the water flow in a spa pool. When filters get clogged with dirt and debris, they block the water from moving properly through the system.

This blockage can cause low water flow, which the flow sensor detects and triggers an FL fault. To keep things running smoothly, it's important to regularly clean or replace the filters.

Clean filters help water flow efficiently and keep the spa in good working condition.

What should I do if the troubleshooting steps do not fix the FL fault in a Jacuzzi® spa?

If the initial troubleshooting steps do not resolve the FL fault in your Jacuzzi spa, it is advisable to seek professional assistance. You can contact your local spa technician for further diagnosis and repair.

The issue might be more complex and could involve components that require technical expertise. Referring to a professional ensures that the problem is accurately identified and appropriately fixed, minimising the risk of further damage to your spa.

In Summary

We hope this article has helped you troubleshoot the FL error in your Jacuzzi® spa.

If these steps don't fix the issue, please contact a professional spa technician for further assistance.

Got questions?

Talk to us or email us your spa questions and we'll be happy to help!

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