Geberit 115125111
Geberit Delta 21 Actuator Plate User Manual
Model: 115125111
1. Product Overview
This manual provides essential information for the installation, operation, and maintenance of the Geberit Delta 21 Actuator Plate, model 115125111. This product is designed for use with Geberit Duofix Basic and Kombifix Basic flush-mounted elements, featuring 2-flow flush technology.

Image 1: Front view of the Geberit Delta 21 Actuator Plate in white, accompanied by mounting screws and plastic anchors.
The Geberit Delta 21 Actuator Plate is a crucial component for concealed cistern systems, providing the interface for flushing operations. Its white finish ensures a clean and modern aesthetic, blending seamlessly with various bathroom designs.
2. Setup and Installation
Proper installation is critical for the optimal performance of your Geberit Delta 21 Actuator Plate. This plate is specifically designed for compatibility with Geberit Duofix Basic wall element 458.103.00.1 and Kombifix Basic flush-mounted element 110.100.00.1.
2.1. Pre-Installation Checklist
- Ensure you have the correct Geberit concealed cistern model (Duofix Basic or Kombifix Basic).
- Verify the dimensions of the actuator plate (245 x 165 x 14 mm) against the cistern's opening.
- Gather necessary tools: screwdriver, measuring tape, level.
2.2. Installation Steps
- Carefully unpack the actuator plate and inspect for any damage.
- Remove the protective film from the front of the plate, if present.
- Align the actuator plate with the mounting frame of the concealed cistern.
- Insert the included screws into the designated holes and gently tighten them to secure the plate. Do not overtighten.
- Ensure the plate is level and flush with the wall surface.

Image 2: Close-up front view of the Geberit Delta 21 Actuator Plate, showing the two circular flush buttons and the Geberit logo at the top right.

Image 3: Rear view of the Geberit Delta 21 Actuator Plate, displaying the internal mounting brackets and flush mechanism components.
3. Operating Instructions
The Geberit Delta 21 Actuator Plate features a 2-flow flush technology, allowing for water-efficient operation.
3.1. Flush Operation
- Full Flush: Press the larger of the two circular buttons for a full flush, typically used for solid waste.
- Reduced Flush: Press the smaller of the two circular buttons for a reduced flush, suitable for liquid waste, conserving water.
Ensure the buttons are pressed firmly and released completely for proper flush activation and reset.
4. Maintenance
Regular maintenance ensures the longevity and proper functioning of your actuator plate.
4.1. Cleaning
- Clean the surface of the actuator plate with a soft, damp cloth and mild, non-abrasive cleaning agents.
- Avoid using harsh chemicals, abrasive cleaners, or scouring pads, as these can damage the finish.
- Dry the surface thoroughly after cleaning to prevent water spots.
4.2. Inspection
- Periodically check the buttons for smooth operation and ensure they return to their original position after pressing.
- Inspect the plate for any signs of looseness or damage. If loose, gently retighten the mounting screws.
5. Troubleshooting
This section addresses common issues you might encounter with your Geberit Delta 21 Actuator Plate.
| Problem | Possible Cause | Solution |
|---|---|---|
| Buttons are stiff or stuck. | Accumulation of dirt or mineral deposits; misalignment. | Clean around the buttons with a damp cloth. Check if the plate is securely mounted and not warped. |
| Flush not activating. | Improper installation; issue with the internal cistern mechanism. | Ensure the plate is correctly installed and screws are tightened. If the problem persists, consult the cistern's manual or a qualified plumber. |
| Plate appears loose. | Mounting screws are loose. | Gently tighten the mounting screws. Do not overtighten. |
For issues not listed here or if troubleshooting steps do not resolve the problem, please contact Geberit customer support or a certified professional.
6. Specifications
Detailed technical specifications for the Geberit Delta 21 Actuator Plate.
| Attribute | Detail |
|---|---|
| Brand | Geberit |
| Model Number | 115125111 |
| Part Number | 115125111 |
| Dimensions (L x W x H) | 245 x 165 x 14 mm (0.55 x 9.65 x 6.5 inches) |
| Item Weight | 13.4 ounces |
| Color | Inspection Plate White |
| Flush Technology | 2-flow flush |
| Compatibility | Geberit Duofix Basic wall element 458.103.00.1, Kombifix Basic flush-mounted element 110.100.00.1 |
| Included Components | Geberit Delta 21 115.125.111 Actuator Plate |

Image 4: Dimensional diagram of the Geberit Delta 21 Actuator Plate, indicating a height of 8.4 inches (21 cm).
7. Warranty and Support
Geberit products are manufactured to high quality standards. For specific warranty information regarding your Geberit Delta 21 Actuator Plate, 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. Contact details can typically be found on the Geberit official website or on your purchase receipt.
Note: Always ensure that any installation or repair work is carried out by qualified personnel to maintain warranty validity and ensure safety.