Why is My Spa Ozone Not Bubbling? Causes and Solutions

Important: A licensed electrician must carry out all electrical work on your spa. Any electrical information included here, whether it is troubleshooting or other instructions, is provided for use by a licensed electrician only. Local electrical codes supersede any information found here.

A spa ozone system is an excellent way to clarify your spa water. If your spa ozone is not bubbling, this can indicate that something is wrong.

Whether it’s a simple blockage or a more complex issue, this guide will walk you through troubleshooting steps to help identify the cause and restore your ozone system properly again.

Key Takeaways:

• A spa ozone system clarifies water, but bubbling issues may indicate a malfunction.
• Common issues include blocked injectors, faulty units, or board problems.
• Follow this guide to troubleshoot or seek professional help if needed.
• Electrical work should always be handled by a licensed electrician.

What is Spa Ozone?

Spa ozone is a water clarification and purification method that uses ozone gas (O3) to clarify and disinfect spa water.

The ozone system typically injects ozone gas into the spa water which can look like bubbles coming from a suction or port in the shell of the spa.

Learn more about Spa Ozone in our detailed article including its key benefits, cost, and more.

How to Troubleshoot Spa Ozone Not Bubbling

One indication that your Ozone system is not working properly is if no bubbles are coming from the suction or ozone jet in your spa during the heating or filtration cycle.

Follow these quick troubleshooting steps to find and fix the issue.

Check for Air Bubbles coming from the spa suction or ozone jet.

Start by inspecting the footwell outlet when the spa is running in the circulation or heating cycle.

If there are no bubbles, follow the troubleshooting steps below:

Step 1. Check for blockages in the Mazzei Injector

• Shut off power to the spa
• Close the valves to isolate the Mazzi Injector so water will not come out when you remove the hose.
• Remove the injector from the plumbing noting the direction of water flow so that you reinstall the injector back the same way it came out.
• Use a garden hose to apply pressure to each port of the injector and make sure water comes out of the other two ports. If the injector remains plugged, you may need to order a new one.

Step 2. Reinstall the injector

• Open the isolation valves and power up your spa.

Step 3. Check the pump

• If your spa uses an older-style ozone pump, you will want to check that the pump is powered up and working.

If you see bubbles but your spa water is not staying clear, follow the troubleshooting steps below:

Step 1: Activate the Clean Cycle and Check the Ozone Unit’s Power

• Remove the front panel and locate the ozone unit. Press the "clean cycle" button on your spa’s touchpad.
• Check O3/UV light: Ensure the O3/UV light illuminates on the ozone unit. If it does, the ozone system is receiving power and working properly
• If the O3/UV does not light, proceed to the next step.

Step 2. Inspect the Ozone Box for the Green Light

• If the green light on the ozone box is off, it means the unit is defective or is not receiving power.
• When the spa circulation cycle is running, a contactless voltage tester on the cable running from the controller to the ozone unit is used to make sure power is present.
• If it is not then proceed to the next step.

Step 3. Test the Main Spa Board and O.MAX Settings

• If all previous steps show that the ozone injector is not plugged in and the ozone unit is not getting power during the circulation cycle, the issue might be with the spa’s main board.
• Check the O.MAX settings is configured correctly (set to NONE).
• If the ozone unit is still not receiving power the output fuse on the controller may be blown or there may be a fault with the board itself.

Please note: Both will require professional attention from a spa technician or licensed electrician.

In Summary

If your spa ozone is not bubbling, the issue could be due to a blocked Mazzei injector. If it is bubbling but you are noticing cloudy water, or no operating indicator light on the ozone unit during the circulation or heating cycle then it may point to a a faulty ozone unit, blown fuse or an issue with the main spa controller board.

Following these troubleshooting steps can help resolve the issue. If you’re unable to identify the cause, it’s best to contact a licensed electrician or professional spa technician.

Got more questions? We’re here to help!