Froeling Lambdatronic Modbus

Home Assistant integration for Fröling Lambdatronic heating systems via Modbus. Currently supports Modbus TCP via a Serial‑to‑Ethernet bridge.

🚀 Features

With this integration, you can:

• Read real-time sensor data from your Fröling system (temperatures, states, pump speeds, consumption, etc.).
• Monitor boiler operation (e.g., Kesselzustand, Anlagenzustand).
• Configure parameters via writable Number entities, using input boxes.
• Control modes via Select entities (e.g., HK01/HK02 Betriebsart with Aus/Automatik/Extraheizen/Absenken/Dauerabsenken/Partybetrieb).
• Inspect the boiler error buffers.

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💻 Requirements

You need a Modbus-to-TCP device. This integration has been tested with the Waveshare RS232/RS485 to Ethernet Converter; other Serial-to-Ethernet adapters should work.

⚠️ Important – RS232 & Nullmodem cable required

Fröling Lambdatronic systems communicate via Modbus RTU over RS232 on COM2.

• ❌ RS485-only adapters will NOT work
• ✔ You must use an RS232-capable Serial-to-Ethernet converter
• 🔁 A nullmodem (crossed) RS232 cable is required (direct / straight RS232 cables will not work)

🔧 Enabling Modbus RTU on the Boiler

To enable Modbus RTU on your Fröling boiler:

1. Click the user icon and enter code -7.
2. Adjust the following settings:
   • Settings > General Settings > MODBUS Settings > Modbus Protokoll RTU → Set to 1
   • Settings > General Settings > MODBUS Settings > Use Modbus Protokoll 2014 → Yes
   • Settings > General Settings > MODBUS Settings > Use COM2 as MODBUS Interface → Yes

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🛠️ Hardware Setup

Use a Serial-to-Ethernet converter between the boiler’s COM2 and your network.

Example 1: Waveshare RS232/RS485 to Ethernet Converter

• Converter connected via RS232 to COM2 on the boiler.

• Example configuration screenshot:

  

Example 2: Waveshare RS232/485/422 TO POE ETH (B) Converter

• Converter connected via RS232 to COM2 on the boiler.

• Example configuration screenshot:

  

Other Serial-to-Ethernet converters should also work.

If you're looking for a way to power your Serial Ethernet converter directly from your Fröling board, check this out: Power Supply

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📦 Installation

HACS (recommended)

• Ensure HACS is installed.
• Search for “Froeling Lambdatronic Modbus” and install.
• Restart Home Assistant.

Manual

• Download the latest release from: https://github.com/GyroGearl00se/ha_froeling_lambdatronic_modbus/releases
• Copy custom_components/froeling_lambdatronic_modbus into your Home Assistant custom_components folder.
• Restart Home Assistant.
• Add the integration via the Home Assistant UI.

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🛠️ Setup

1. Settings → Integrations → “+ Add Integration”.
2. Select “Froeling Lambdatronic Modbus”.
3. Fill out the form:
   • Device name (Default: Froeling)
   • Hostname/IP of your Modbus TCP device
   • Port (Default: 502)
   • Update Interval (Default: 60s)
   • Select installed components on your unit:
     • Kessel (Boiler)
     • Fehlerpuffer (Error Buffer)
     • Boiler 01 (DHW Boiler)
     • Heizkreis 01 (Heating Circuit)
     • Heizkreis 02 (Heating Circuit)
     • Austragung (Feed System)
     • Puffer 01 (Buffer)
     • Zirkulationspumpe (Circulation Pump)
     • Zweitkessel (Second Boiler)
4. Submit and wait for entities to appear.

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📊 Entities Overview

• Sensors:
  • Temperatures (e.g., Kesseltemperatur, Abgastemperatur, HK Vorlauf), loads, consumption, etc.
• Text Sensors:
  • Anlagenzustand, Kesselzustand (mapped from numeric states).
  • Boiler error buffers (20 slots)
• Numbers:
  • Writable setpoints and parameters (e.g., Kessel_Solltemperatur).
  • Proper step sizes and input box UI.
• Selects:
  • Betriebsart for heating circuits (e.g., HK01/HK02), options: Aus, Automatik, Extraheizen, Absenken, Dauerabsenken, Partybetrieb.

🧩 Visualization

• Lovelace: Checkout the Fröling Card (HACS): https://github.com/GyroGearl00se/lovelace-froeling-card
• Example:

🧡 Contributing

Contributions are welcome!

1. Fork this repository.
2. Make changes within your fork.
3. Create a pull request.

I’ll do my best to review and merge contributions.

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Disclaimer

This project is not affiliated with or endorsed by Fröling. All trademarks are property of their respective owners.