4-Zone Wall Controller Firmware Update: Latest Features for Existing Customers

If you have already purchased a TekOnline 4-Zone Wall Controller, the latest firmware adds a few useful features without changing the core wall-control experience.

The front buttons still work locally at the wall, but the controller now gives you better behavior for pressure-relief style spill setups, better visibility in Home Assistant, and safer network behavior when you have more than one controller on site.

What Stays the Same

The basics are unchanged:

each front button still controls its matching zone
a short press still toggles that zone
hold-to-dim still adjusts the zone level
the controller still works locally even if Home Assistant is offline

That part was kept stable on purpose.

New Feature: Spill Zone Support

The biggest firmware addition is Spill Zone support.

In Home Assistant, you can now choose:

Off
Zone 1
Zone 2
Zone 3
Zone 4

If a spill zone is selected and every other zone is off, the controller can automatically open that nominated spill zone.

This is useful on systems where you want one zone available for pressure relief when the rest of the zones are closed.

New Feature: Spill Now Shows on the Wall Buttons

The spill behavior is now reflected on the wall itself.

For example:

A user turns all zones off.
The controller detects that the configured spill zone should open.
That spill zone relay turns on.
The matching wall-button illumination also turns on.

That means the wall controller gives a more honest picture of what the system is actually doing, instead of only showing what was pressed manually.

New Feature: Better Visibility in Home Assistant

The latest firmware also exposes more useful diagnostic entities in Home Assistant.

These include:

Spill Zone select
Spill Active
Zone 1 Relay Active through Zone 4 Relay Active
Zone 1 Button Illumination through Zone 4 Button Illumination
Zone 1 Relay Effective Level through Zone 4 Relay Effective Level

This is especially useful if you are away from the hardware and want to confirm:

whether spill is active
which relay is actually being driven
which front-button illumination level the controller is currently showing

New Feature: Multiple Controllers on One Network

The latest firmware also improves multi-controller installs.

Each controller now adds a unique suffix to its network name, which helps avoid hostname clashes when you have more than one 4-Zone Wall Controller on the same network.

Instead of two devices both trying to appear as the same name, each one will present with its own unique hostname.

That makes discovery and management in ESPHome and Home Assistant much cleaner.

Why This Update Matters

This update is mainly about making the controller easier to trust in real systems:

the wall still feels simple to use
spill logic is configurable from Home Assistant
button illumination reflects effective output, not just manual presses
relay behavior is easier to inspect remotely
multi-device installs are cleaner

In short, the controller is still simple for day-to-day use, but more transparent and more robust for advanced installs.

Should Existing Customers Update?

You should consider the latest firmware if:

you want a nominated spill zone
you want to inspect button illumination or relay behavior in Home Assistant
you are installing more than one wall controller on the same network
you want the latest dimming and spill behavior improvements

If your current controller is already doing exactly what you need and you do not need spill or extra visibility, you may prefer to leave it as-is.

Need Help Updating?

If you want the latest firmware on your existing 4-Zone Wall Controller, contact TekOnline.

Include:

your current Home Assistant setup
whether the controller is already connected to ESPHome
whether you want spill enabled
how many controllers you have on the network

That makes it much easier to recommend the right firmware variant for your install.

Download the Latest YAML Firmware

The latest ESPHome YAML is available for download and self-flash. This release adds hold-to-dim PWM, spill zone control, unique entity naming, and PWM button illumination.

Firmware v2026.05.07 – Hold-to-Dim with Spill Control – Download the YAML, rename .txt to .yml, and flash via ESPHome.