Your Rain Bird ESP-TM2 is already one of the most reliable irrigation controllers on the market — but did you know you can control it from your smartphone, anywhere in the world? With the Rain Bird LNK2 WiFi Module, adding smart control to your existing ESP-TM2 is a simple plug-and-play upgrade that takes less than 10 minutes.
In this guide, we'll walk you through everything you need to know: compatibility, installation, app setup, and tips for getting the most out of your smart irrigation system.
What You'll Need
- Rain Bird ESP-TM2 Controller (4, 6, 8, or 12-station)
- Rain Bird LNK2 WiFi Module
- A 2.4GHz WiFi network
- A smartphone (iOS or Android) with the Rain Bird app installed
💡 Pro tip: Save time and money by purchasing the Rain Bird ESP-TM2 12-Station WiFi Bundle — it includes both the controller and LNK2 module together.
Is Your ESP-TM2 Compatible?
The LNK2 module is compatible with Rain Bird ESP-TM2 controllers and ESP-Me controllers manufactured after November 2, 2016. Check the label on the back of your controller for the manufacture date. If your controller is older, you may need to upgrade the unit itself.
The LNK2 requires a 2.4GHz WiFi network — it does not support 5GHz. If your router broadcasts both bands under the same name, you may need to temporarily separate them during setup.
Step-by-Step Installation
Step 1: Power Off the Controller
Turn the dial to the OFF position before installing the module. This isn't strictly required, but it's good practice.
Step 2: Locate the LNK Port
On the front of your ESP-TM2, look for the small port labeled LNK — typically in the upper-right area of the controller face. Remove the port cover if present.
Step 3: Plug In the LNK2 Module
Insert the LNK2 module firmly into the LNK port. You'll feel it click into place. The module's LED indicator will begin flashing.
Step 4: Download the Rain Bird App
Download the Rain Bird app from the App Store or Google Play. Create a free Rain Bird account if you don't already have one. Requires app version 2.18 or later.
Step 5: Pair the Module (Quick Pair Technology)
The LNK2 features Rain Bird's Quick Pair Technology for fast setup:
- Open the Rain Bird app and tap Add a Device
- Select LNK2 WiFi Module
- Follow the on-screen prompts to connect to your 2.4GHz WiFi network
- Once connected, the LED on the LNK2 will turn solid green
Step 6: Name Your Zones
Once paired, the app will prompt you to name each irrigation zone (e.g., "Front Lawn", "Back Garden", "Drip Zone"). Taking a few minutes to label your zones now will make scheduling much easier later.
Key Features Once Connected
- Remote scheduling — adjust watering times from anywhere via the app
- Weather intelligence — the app automatically skips watering when rain is detected in your area
- Real-time alerts — get notified of system errors or unusual water usage
- Seasonal adjust — increase or decrease all zone runtimes by a percentage without reprogramming
- Water usage tracking — monitor how much water each zone uses over time
Troubleshooting Common Issues
LNK2 won't connect to WiFi: Ensure you're using a 2.4GHz network, not 5GHz. Move your router closer during initial setup if signal is weak.
LED is flashing red: This typically indicates a connection error. Reset the module by holding the button on the LNK2 for 10 seconds, then repeat the pairing process.
App can't find the controller: Make sure your phone is connected to the same WiFi network as the LNK2 during initial setup. After pairing, you can control it from any network.
Controller manufactured before Nov 2016: Older ESP-TM2 units are not compatible with the LNK2. Consider upgrading to a current model.
Ready to Upgrade?
Adding WiFi to your Rain Bird ESP-TM2 is one of the easiest and most impactful upgrades you can make to your irrigation system. Whether you're managing water usage, setting schedules remotely, or just tired of walking out to the controller every time — the LNK2 makes it effortless.