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Can I Control an Extractor Fan with a Lightwave Dimmer?

This article provides a comprehensive overview of the compatibility between Lightwave dimmer models (LP21, LP22, LP23, and LP24) and extractor fans. It outlines key considerations, potential risks, and recommended practices to ensure safe and reliable integration within a smart home environment.

No — Lightwave dimmers are not suitable for controlling extractor fans. Fans are considered non-dimmable appliances, and attempting to control one with a Lightwave dimmer can lead to failure. An LP82/LP81 Smart Relay is required, which the dimmer can then speak to wirelessly 

⚠️ Why Not Use a Dimmer?

  • Dimmers are designed for dimmable lighting circuits only

  • Extractor fans typically require a constant on/off supply

✅ Recommended Solution: Use a Relay

To safely and effectively control an extractor fan, use a Lightwave Smart Series Relay (LP81/LP82) instead of a dimmer. Relays are designed for switching non-dimmable loads, making them ideal for extractor fans.

🔄 Optional: Wireless Control Using a Dimmer

If you want to use a dimmer as a control interface (e.g. a wall switch), you can:

  1. Install the fan on a Lightwave relay

  2. Set up a GROUP automation in the Lightwave app

  3. Configure the dimmer (or button press) to wirelessly trigger the relay

  4. (Optional) Add a timer to automatically turn the fan off after a set time (e.g. 15 minutes)

This allows you to control the fan using a dimmer switch — without physically connecting them — and still maintain safe, compatible operation.

🧠 Summary

Appliance Compatible with Dimmer? Recommended Setup
Bathroom extractor fan ❌ No ✅ Lightwave relay + automation
General dimmable lighting ✅ Yes ✅ Lightwave Dimmer