Froeling Lambdatronic Modbus

Home Assistant integration for Fröling Lambdatronic heating systems via Modbus (currently supports Modbus TCP only).

⚠️ Disclaimer ⚠️

This integration is experimental and has not been tested over long periods.
It may contain missing or incorrect sensor data.
Feel free to open an issue or contribute via a pull request.

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🚀 Features

With this integration, you can:

• Read real-time sensor data from your Fröling heating system.
• Monitor boiler performance and operational parameters.
• Configure heating system settings directly from Home Assistant.

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💻 Requirements

To communicate with the heating system, you need a Modbus-to-TCP device.
This integration has been tested with the Waveshare RS232/RS485 to Ethernet Converter, but other Serial-to-Ethernet adapters should work.

🔧 Enabling Modbus RTU on the Boiler

To enable Modbus RTU on your Fröling boiler:

1. Navigate to Boiler Settings.
2. Click the user icon and enter code -7.
3. 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

I used a Waveshare RS232/RS485 to Ethernet Converter and connected RS232 to COM2 on the boiler.

Other Serial-to-Ethernet converters should work as well.

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📦 Installation

1. Copy the integration files into your Home Assistant custom_components folder.
2. Restart Home Assistant.
3. Add the integration via the Home Assistant UI.

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🧡 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.