Ozone (O3) Button Does Nothing: Checking the Relay Click, the Air Tube, and Swapping Relays to Test

When the ozone (O3) button on your Ella walk-in tub does nothing, the first check is to listen for the click of the relay switch on the control box as you press the button. A click means the relay is switching. No click means the clear air tube from the button is not plugged firmly at the relay. Swapping the LED and O3 air tubes at the control box is a quick test that shows whether the relay itself works, and Ella ships a replacement relay under the parts warranty if it is needed.

How the Ozone Button Works

The O3 button is an air-actuated push control, the same type as the chromatherapy light button. Pressing it sends a puff of air down a clear tube to a small relay switch on the control box under the tub. That relay turns the ozone generator on and off. There are two similar relays on the control box, one for the LED light and one for the ozone, so the two buttons can be compared directly. General push-button behavior is described in what push controls are, and the ozone system itself in what ozone sterilization is.

Step 1: Listen for the Click

1. Press the LED light button and note the click from under the tub as the light comes on.
2. Press the O3 button and listen for the same click.
3. If you hear the click, the relay switch is working properly. Open a ticket with a video of the test so tech support can look further.
4. If there is no click, the air tube is not plugged firmly at the relay. Continue with the steps below.

Step 2: Reseat the Air Tube at the Relay

1. Turn off the GFCI breaker that feeds the tub before opening the access panel.
2. Remove the magnetic access panel next to the door to reach the control box.
3. Trace the clear air tube from the O3 button down to the control box. The relay it leads to is the ozone relay.
4. Push the tube firmly onto the relay so it is fully seated.
5. Restore power and press the O3 button again, listening for the click.

Step 3: Swap the Tubes to Test the Relay

If reseating does not bring back the click, swap the two air tubes at the control box so the LED tube is on the ozone relay and the O3 tube is on the LED relay. This is a test only. With the tubes swapped, the LED button will control the ozone and the O3 button will control the light. If the ozone turns on from the LED button, the ozone relay is working and the fault is in the O3 button or its tube. If the light turns on from the O3 button but the ozone does not turn on from the LED button, the ozone relay is the faulty part. Turn the breaker off and swap the tubes back when you are done.

Step 4: Replacing the Relay

A failed relay ships under the parts warranty. Open a ticket at ellasbubbles.com/support with your serial number, a description of the tests you ran and, if possible, a short video. Ella ships the replacement relay, and a local licensed electrician or your installer fits it with the GFCI breaker off. Ella does not send technicians. If the whole massage system is dead rather than just the ozone, work through pump or massage system not working first, since a tripped breaker affects every button.

Related Guides

• Why Does My Walk-In Tub Ozone Generator Run All the Time, and Can I Turn It Off?
• What is ozone sanitation, and is the light humming noise from my tub normal?
• How Do I Replace a Broken Push Button and Its Air Hose?

Common Questions

Still Need Help?

Open a ticket at ellasbubbles.com/support or call (800) 480-6850 and have your model and serial number ready.