Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Mi-Heat H3 Digital Touch Screen Thermostat. Please read this manual thoroughly before installation and use to ensure proper function and safety.
Key Features:
- Digital touch screen display
- Programmable weekly schedule (6 periods daily, 5+2/6+1/7 days)
- Integrated and external NTC 10kOhm 2m sensors
- Key lock / child safety function
- Frost protection mode
- Suitable for electric and water-based underfloor heating systems
- Flush-mounted design
Safety Information
Important: Electrical installation should only be performed by a qualified electrician in accordance with local regulations. Disconnect power before installation or maintenance.
- Ensure the power supply is disconnected before wiring.
- Do not expose the thermostat to water or excessive humidity.
- Do not attempt to repair or modify the device yourself. Contact qualified personnel.
- Keep out of reach of children.
Package Contents
Verify that all items are present in the package:
- 1x Mi-Heat H3 Thermostat
- 1x Floor Sensor (NTC 10kOhm, 2m cable)
- 1x User Manual (this document)
- 1x Mounting Material (screws)
Image: Mi-Heat H3 Thermostat and included accessories.
Product Overview
The Mi-Heat H3 thermostat features a clear digital touch screen for easy temperature control and programming. It can measure both room and floor temperatures using its internal and external sensors.
Image: Front view of the Mi-Heat H3 Thermostat with its floor sensor cable.
Display Elements:
Image: Explanation of the Mi-Heat H3 thermostat display icons and buttons.
- Clock: Displays current time.
- Power ON/OFF: Button to turn the thermostat on or off.
- Menu: Accesses settings and programming options.
- Heating Mode: Indicates the current heating mode.
- Week/Stage: Shows the current day of the week and program stage.
- Up/Down Keys: Adjust temperature settings or navigate menus.
- Room Temperature: Displays the current ambient temperature.
- Air or Floor Measurement: Indicates which sensor is active.
- Auto Mode: Activates the programmed schedule.
- Key Lock: Engages child safety lock.
Installation & Setup
The Mi-Heat H3 thermostat is designed for flush-mounted installation. Ensure the power supply is disconnected before proceeding.
Dimensions:
Image: Physical dimensions of the thermostat and sensor cable length.
- Thermostat Dimensions (LxHxD): 86x86x45mm
- Flush-mounted box dimensions: 5x5cm (approx.)
- External Sensor Cable Length: 3m
Wiring Diagram:
Connect the thermostat according to the appropriate wiring diagram for your heating system. Always consult a qualified electrician.
Image: Wiring diagrams for various heating systems (electric underfloor, infrared, water-based with actuator).
General Wiring Steps:
- Disconnect the main power supply.
- Mount the thermostat into a standard flush-mounted box.
- Connect the Live (L) and Neutral (N) power supply wires to the corresponding terminals on the thermostat (Input: 230V AC, 50/60Hz).
- Connect the heating load wires (L1, N1) to the LOAD terminals.
- Connect the external floor sensor (if used) to the SENSOR terminals (T1, T2).
- Secure the thermostat to the wall box using the provided screws.
- Restore power and test the thermostat.
Image: Rear view of the thermostat showing terminal connections.
Operating Instructions
The Mi-Heat H3 thermostat offers intuitive control via its touch screen interface.
Basic Operation:
- Power ON/OFF: Press the power icon (⏻) to turn the unit on or off.
- Temperature Adjustment: In manual mode, use the Up (▲) and Down (▼) arrows to set the desired temperature.
Weekly Programming:
The thermostat supports flexible weekly programming with 6 periods per day. You can choose between 5+2 days (weekdays + weekend), 6+1 days (Mon-Sat + Sunday), or 7 individual days.
Image: Example of a weekly program schedule.
- Press the Menu icon (📖) to enter programming mode.
- Navigate through the settings using the Up/Down arrows.
- Set the desired time and temperature for each of the 6 periods for each day or group of days.
- Confirm settings to save the program.
Key Lock / Child Safety:
To prevent unintended changes, activate the key lock function.
- Press and hold the Key Lock icon (🔒) for a few seconds to lock or unlock the keypad.
Sensor Selection:
The thermostat can operate using its internal room sensor, the external floor sensor, or a combination of both (e.g., floor sensor with room temperature limit).
Refer to the advanced settings in the menu to configure the sensor mode.
Maintenance
The Mi-Heat H3 thermostat requires minimal maintenance.
- Cleaning: Wipe the screen and casing with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- No User-Serviceable Parts: Do not attempt to open the thermostat casing.
Troubleshooting
If you encounter issues with your thermostat, refer to the following common problems and solutions:
- No Display / No Power:
- Check the main power supply to the thermostat.
- Ensure wiring connections are secure.
- Heating Not Activating:
- Verify the thermostat is in heating mode and not in OFF or frost protection mode.
- Check the set temperature; it must be higher than the current room/floor temperature.
- Inspect wiring connections to the heating element.
- Incorrect Temperature Reading:
- Ensure the sensor is correctly installed and not covered.
- If using an external sensor, check its connection.
- The thermostat may require calibration (refer to advanced settings, if available).
- Keypad Unresponsive:
- Check if the key lock/child safety function is active. Unlock it if necessary.
If the problem persists, contact customer support.
Specifications
| Feature | Specification |
|---|---|
| Model Number | H3 |
| Mounting Type | Flush-mounted |
| Operating Voltage | 230V AC, 50/60Hz |
| Max. Switching Power | 16A / 3680 Watt |
| Control Mode | Two-point control (ON-OFF) |
| Operating Temperature | 5-40°C |
| Sensors | Internal & External NTC 10kOhm (2m cable for external) |
| Temperature Control Range (Internal) | 5-35°C (Room sensor) |
| Temperature Control Range (External) | 5-90°C (Floor sensor) |
| Frost Protection | Yes |
| Floor Limitation Range | 40-90°C |
| Display / Backlight | Touch screen / Yes |
| IP Rating | IP21 |
| Dimensions (LxHxD) | 86 x 86 x 45 mm |
| Material | Plastic |
| Weight | 200 g |
| Connectivity | Wi-Fi |
Warranty & Support
For questions regarding your Mi-Heat H3 thermostat, your order, or project implementation, please contact Mi-Heat customer support.
- Support Availability: Monday to Friday, 09:00 to 16:00 (CET).
- Contact: Please refer to the seller's contact information on the purchase platform or the official Mi-Heat website for specific contact details.
Mi-Heat offers support and shipping directly from Germany.