1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Rehau Nea H Thermostat, model 336230-001. Please read these instructions carefully before beginning installation or operation and retain them for future reference.
2. Safety Information
Warning: Electrical installation should only be performed by a qualified electrician in accordance with local regulations and standards. Disconnect power at the main circuit breaker before performing any installation or maintenance work.
- Ensure the power supply matches the thermostat's requirements (230 V).
- Do not expose the thermostat to moisture or extreme temperatures.
- Keep out of reach of children.
- Do not attempt to open or repair the device yourself. Contact qualified service personnel.
3. Product Overview
The Rehau Nea H Thermostat (Model 336230-001) is designed for controlling heating systems, particularly underfloor heating. It features a clear, backlit display and intuitive controls for temperature adjustment.

Figure 1: Rehau Nea H Thermostat. This image displays the Rehau Nea H Thermostat in white. It features a central digital display and two control buttons, marked with '+' and '-' symbols, for adjusting settings. The side profile shows a ribbed design.
Key Features:
- Digital display with backlight
- Simple button control for temperature settings
- Designed for 230 V electrical systems
- White finish
4. Setup and Installation
Installation of the Rehau Nea H Thermostat requires electrical wiring and should only be carried out by a qualified professional. Ensure the main power supply is disconnected before commencing installation.
- Power Disconnection: Turn off the main power supply to the area where the thermostat will be installed at the circuit breaker.
- Mounting Location: Choose a suitable indoor location, away from direct sunlight, drafts, or heat sources, which could affect temperature readings.
- Wiring: Connect the thermostat to the 230 V electrical system according to the wiring diagram provided with the product packaging (not included in this manual). Ensure all connections are secure and correctly insulated.
- Mounting: Secure the thermostat to the wall using appropriate screws and wall plugs.
- Power Connection: Once installation is complete and all connections are verified, restore power at the main circuit breaker.
For detailed wiring instructions, refer to the specific diagrams included with your product packaging. If you are unsure about any step, consult a qualified electrician.
5. Operating Instructions
The Rehau Nea H Thermostat is designed for straightforward operation to control your heating system.
5.1 Adjusting Temperature
- Use the '+' button to increase the desired temperature.
- Use the '-' button to decrease the desired temperature.
- The current set temperature will be displayed on the backlit screen.
5.2 Display Information
The thermostat features a backlit display that shows the current temperature and other relevant information. Some models may also display the current date.
5.3 Heating Function
The thermostat is specifically designed for heating applications. It will activate your heating system when the ambient temperature falls below your set desired temperature and deactivate it once the desired temperature is reached.
6. Maintenance
The Rehau Nea H Thermostat requires minimal maintenance.
- Cleaning: Gently wipe the thermostat's surface with a soft, dry cloth. Do not use abrasive cleaners, solvents, or chemical sprays, as these can damage the device.
- Inspection: Periodically check for any visible damage or loose connections. If any issues are found, disconnect power and consult a qualified technician.
7. Troubleshooting
If you encounter issues with your Rehau Nea H Thermostat, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat display is off. | No power supply. | Check the circuit breaker and ensure power is supplied to the thermostat. Verify wiring connections. |
| Heating system not responding. | Incorrect temperature setting; wiring issue; heating system fault. | Ensure the desired temperature is set higher than the current room temperature. Check wiring. Consult a heating technician if the heating system itself is not functioning. |
| Inaccurate temperature reading. | Thermostat exposed to drafts, direct sunlight, or heat sources. | Relocate the thermostat if possible, or shield it from external influences. |
If the problem persists after attempting these solutions, contact a qualified electrician or the Rehau customer support.
8. Technical Specifications
| Brand | Rehau |
| Model Number | 336230-001 |
| Type | Nea H Thermostat |
| Color | White |
| Power Supply | 230 Volt (AC) |
| Material | Plastic |
| Finish | Polished |
| Display Style | Backlit |
| Special Features | Date function |
| Product Dimensions | 2.6 x 8.8 x 8.8 cm |
| Item Weight | 130 grams |
| Usage | Heating |
9. Warranty and Support
For information regarding warranty terms and conditions, please refer to the documentation provided with your purchase or visit the official Rehau website. For technical support or service inquiries, please contact Rehau customer service directly.
Rehau Official Website: www.rehau.com