1. Introduction
This manual provides essential information for the installation, operation, and maintenance of your Geberit Sigma30 Dual Flush Actuator Plate. Designed for Geberit Sigma flush cisterns, this actuator plate offers a reliable and efficient dual flush mechanism for water conservation. Please read these instructions carefully before proceeding with installation or use.

Figure 1: Front view of the Geberit Sigma30 Dual Flush Actuator Plate. This image shows the two flush buttons, indicating the dual flush functionality.
2. Product Features
- Specifically designed for Geberit Sigma flush cisterns.
- Features dual flush capability for efficient water usage.
- Push rods are sound-insulated for quiet operation.
- Tool-free quick adjustment of push rods for easy setup.
- Actuation force is less than 20 N, ensuring light touch operation.
- Plate and buttons are white matt lacquered with an easy-to-clean coating.
- Design strips are glossy chrome-plated for an aesthetic finish.
3. Package Contents
Verify that all components are present in the package before beginning installation:
- Geberit Sigma30 Actuator Plate
- Mounting frame
- 2 Spacer bolts
- 2 Push rods
4. Setup and Installation
Follow these steps for proper installation of the Geberit Sigma30 Actuator Plate. Refer to the detailed assembly instructions provided by the cistern manufacturer for specific guidance on the cistern mechanism.
- Mount the Actuator Plate: Carefully mount the actuator plate to the cistern mechanism. Ensure it aligns correctly with the designated mounting points on the cistern frame.
- Connect to Cistern Mechanism: Connect the push rods to the cistern mechanism. The sound-insulated push rods are designed for tool-free quick adjustment. Ensure they are securely attached and move freely.
- Test Functionality: After mounting and connecting, test the actuator plate to ensure it works properly for both 2-volume flushes. Press each button to confirm the flush mechanism engages correctly.

Figure 2: Technical drawing showing the front view and width/height dimensions of the actuator plate (24.6 cm width, 16.4 cm height).

Figure 3: Technical drawing illustrating the side profile and thickness of the actuator plate (1.2 cm depth).
5. Operation
The Geberit Sigma30 Actuator Plate is designed for front operation and features a dual flush system:
- Full Flush: Press the larger button for a full flush, typically used for solid waste.
- Reduced Flush: Press the smaller button for a reduced flush, suitable for liquid waste, conserving water.
Ensure the buttons return to their original position after each flush.
6. Maintenance
The Geberit Sigma30 Actuator Plate features an easy-to-clean coating. To maintain its appearance and functionality:
- Clean the surface regularly with a soft, damp cloth.
- Use mild, non-abrasive cleaning agents. Avoid harsh chemicals, abrasive pads, or solvents, as these can damage the finish.
- Periodically check the movement of the flush buttons and push rods to ensure they operate smoothly.
7. Troubleshooting
If you experience issues with your Geberit Sigma30 Actuator Plate, consider the following:
- Buttons sticking or not returning: Check for any obstructions around the buttons or push rods. Ensure the push rods are correctly aligned and not bent.
- Inconsistent flushing: Verify that the push rods are properly connected to the cistern mechanism and that their length is correctly adjusted according to the cistern manufacturer's instructions.
- No flush activation: Confirm that the actuator plate is securely mounted and that the push rods are making proper contact with the cistern's flush valve.
For persistent issues, it is recommended to consult a qualified plumber or contact Geberit customer support.
8. Specifications
| Model Number | 115.883.JT.1 |
| Brand | Geberit |
| Color | White (matt coated) |
| Material | Plastic |
| Item Weight | 0.33 Kilograms |
| Installation Type | Wall Mural (for concealed cisterns) |
| Dimensions (W x H x D) | 24.6 cm x 16.4 cm x 1.2 cm |
| Actuation Force | < 20 N |
| Flush Type | Dual Flush (2 quantities) |
9. Warranty and Support
For information regarding product warranty, please refer to the warranty documentation included with your purchase or visit the official Geberit website. For technical support, spare parts, or further assistance, please contact Geberit customer service directly. Contact details can typically be found on the manufacturer's website or in your product packaging.