This page walks through the Air + Hydro Therapeutic Massage component diagram, the one-page drawing that many Ella walk-in tub product pages link to under their specifications. It comes from the official document air-hydro.pdf, revision dated 01-16-26, which is printed as "Available With: Stainless Steel, Outward Door."

The Diagram Linked from Many Product Pages

The drawing is a system schematic rather than a dimension drawing. It shows every powered component in the Air + Hydro package, how each one connects to the control box, and the path that water and air travel to reach the jets. Because the same package is offered on both the stainless steel inward-swing door family and the outward-swing door family, one diagram serves many models. Jet counts are not printed here; the legend says to "Refer to Technical drawing for jet Count," so use your model's spec sheet for the exact number of seat and foot jets. A printed disclaimer on the page reads: "Please View Specifications for Electrical Amperage (A), Voltage (V) and Wattage (W)."

The Six Numbered Components

The legend along the bottom of the drawing numbers six components. The table below repeats the printed labels.

The air massage pump is a variable speed blower. On the push control, one press gives high speed, a second press medium, a third press low, and a fourth press turns it off. About 20 minutes after you turn the air pump off, the Auto Purge starts on its own and runs for 120 seconds to blow leftover water out of the air lines. That short blowing sound after a bath is normal and needs no action. You can read more about it in how the auto purge air system works.

Load 1 and Load 2 on the Control Box

The Electronic Component Controller is drawn as a control box with two labeled outputs, Load 1 and Load 2. Each pump plugs into the box as a separate 110V load, and the box switches them on and off through relays when you press the deck controls. This is why one working massage and one silent massage usually points to a single load: the box is alive, but one pump, cord, or relay is not responding. The green power light on the box is your first clue when nothing at all responds; see control box has no power light for that check.

Water Path and Air Path

The two therapies never share plumbing. On the hydro side, the hydro pump pulls water from the tub and pushes it "Out To Hydro Jets," through the In-Line Water Heater, and on to the hydro jets. The heater sits between the pump output and the jets and is wired through the control box, so it only runs while the hydro pump runs; it maintains the temperature of the circulating water rather than heating a still tub. The Ozone Generator is drawn with an arrow labeled "Ozone Out to Hydro System," meaning ozone is injected into that same hydro loop for sanitation. On the air side, the Air Pump sends air through an Air Hose labeled "Air Out to Jets" to the separate air jets. A second Air Hose runs from the Air Flow Hydro Massage Intensity Dial Control to the hydro system, which is how turning the dial changes the feel of the hydro jets by mixing in air.

Deck Push Controls Shown

At the top of the drawing you will find the controls that live on the tub deck: three push controls labeled Hydro Massage, LED Light, and Air Massage, plus the Air Flow Hydro Massage Intensity Dial Control. Each push control is a simple On/Off button that signals the control box. The dial is not electrical at all; it is an air control on an air hose. The companion article hydro massage vs air massage controls covers the feel of each therapy.

Electrical Printed on the Diagram

The wall outlet is printed as GFCI Protected, Dedicated Line, 20 AMP, 120 Volts. Every powered component is marked Electrical 110V, and the Air Pump carries its own rating of 110-120 V, 4.5 A. For amperage of the hydro pump, heater, ozone generator, and LED light, the drawing sends you to the spec sheet. Two ratings are worth keeping separate: the LED chromatherapy light is 0.5A and runs on its own transformer and control, while ozone sterilization is 0.04A. A full model-by-model summary lives in electrical requirements by model, and the chromatherapy system is described in the chromatherapy lights guide.

First Checks When Nothing Runs

1. Confirm the outlet is a dedicated 20 amp, 120 volt GFCI circuit and that the GFCI has not tripped. Press reset on the receptacle or breaker.
2. Remove the access panel and look for the green power light on the control box. No light means the box is not receiving power.
3. Check that the air pump and hydro pump cords are plugged into the control box loads and that each connector is fully seated. The article on cords, control boxes and connections after install shows what the connections should look like.
4. Press each deck button once and listen for its pump. One silent pump with the other running points to that pump's cord, relay, or the pump itself.
5. If the box has power but nothing responds, contact your Ella dealer or the team at (800) 480-6850, or open a request at ellasbubbles.com/support with your serial number.

The video shows the proper electrical connections behind the apron: if one massage does not work, check that its pump and cord are plugged in and powered, and if the whole tub is dead, check the green power light on the control box first.

Download the official document: Air + Hydro Therapeutic Massage Component Diagram

Common Questions