TekOnline

Category: hvac

  • 4-Zone Wall Controller Firmware v2026-05-17: Relay Inversion, OTA Updates, and Version Display

    This firmware update is for the TekOnline 4-Zone Wall Controller. Current firmware version: 2026.05.17-v2-hold-dimmer-unique-spill-invert What changed This release keeps the existing hold-to-dim and spill-zone behaviour, and adds three support-focused improvements: per-zone relay inversion switches a TekOnline firmware version visible in Home Assistant clearer support for OTA updates from the ESPHome Dashboard Per-zone relay inversion Some…

  • 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…

  • How to Set Up the TekOnline 4-Zone Wall Controller in Home Assistant

    If you have just received your TekOnline 4-Zone Wall Controller, this guide will walk you through the first setup and get it connected to Home Assistant. The process is straightforward: power the controller connect it to your 2.4 GHz Wi-Fi add it to Home Assistant start using the front buttons and relays What the controller…

  • ESPHome StringRef Compile Error on the 4-Zone Wall Controller

    Some customers using the TekOnline 4-Zone Wall Controller may see a compile error when flashing the newer hold-to-dim firmware in ESPHome. The error looks similar to: cannot convert 'esphome::StringRef' to 'const char*' in initialization It may point to a line similar to: const char *spill = id(spill_zone).current_option(); What caused it This was an ESPHome version…

  • 4-Zone Wall Controller Firmware v2026.05.07 – Hold-to-Dim with Spill Control

    Latest Firmware: v2026.05.07 This is the latest ESPHome YAML for the 4-Zone Wall Controller (4zoneWallV1), featuring hold-to-dim PWM control with unique naming and relay-only spill overlay. What is New in This Version Download Download tekonline-4zone-wall-controller-v2026.05.13-fixed.yml (rename .txt to .yml after download – WordPress blocks .yml uploads) 2026-05-13 note: This download includes the StringRef lambda compatibility…

  • How To Hook Up The New 4-Zone Wall Controller

    Step-by-step instructions for safely replacing an existing 24V AC zone controller with the TekOnline 4-Zone Wall Controller, starting with a live 24V AC compatibility check before power-down.

  • 4-Zone Wall Controller Faceplate Update: Working Toward a Cleaner Clipsal 2000 Series Style Look

    4-Zone Wall Controller Faceplate Update: Working Toward a Cleaner Clipsal 2000 Series Style Look

    We are developing a cleaner faceplate direction for the TekOnline 4-Zone Wall Controller, aiming for a more familiar wall look inspired by the Clipsal 2000 Series style while keeping local-first control and physical zone buttons.

  • 4-Zone Wall Controller Compatibility List

    Check whether the TekOnline 4-Zone Wall Controller is a likely replacement for your existing 4-zone wall controller, including the SZ-SW4, and see what details to send before ordering.

  • ESPHome 8-Zone HVAC Controller V2 Setup Guide

    Thanks for purchasing the ESPHome 8-Zone HVAC Controller V2. This guide shows you how to: connect the board by USB flash it in ESPHome add it to Home Assistant check the logs to confirm the board is responding adjust relay inversion settings if a zone behaves backwards then connect 24V AC so the relays can…

  • Can I Replace My iZone System with an ESPHome HVAC Zone Controller?

    If you are currently using an iZone system and wondering whether our ESPHome 24V AC HVAC Zone Controller is a simple plug-in replacement, you are definitely not alone. This is one of the most common questions we get. The honest answer is: sometimes yes, sometimes no. It really depends on how your existing air conditioning…