The Heatmiser neoStat-HC is a smart heating and cooling thermostat designed for fan coil, heat/cool, and ventilation control. It belongs to the Heatmiser neo Stat Series and can connect to the neoHub for app-based control through the Heatmiser neoApp.
The official manual covers installation, system type selection, neoHub pairing, mesh networking, approach sensor behavior, display icons, temperature control, fan speed, comfort levels, frost protection, holiday mode, ventilation mode, feature settings, wiring diagrams, error codes, and factory reset instructions.
Key Product Functions
The Heatmiser neoStat-HC can control different heating, cooling, and fan setups depending on the selected system type.
Main functions include:
- Heating control
- Cooling control
- Auto heat/cool mode
- Ventilation mode
- 3-speed fan control
- Manual or automatic fan speed
- App pairing through neoHub
- Mesh network communication
- Comfort level programming
- Temperature hold
- Holiday mode
- Frost protection / standby mode
- Keypad lock
- Valve cycling
- Cool air proof delay
- Factory reset
Important Installation Notes
The neoStat-HC is designed for flush mounting and requires a 35mm minimum depth back box installed in the wall before fitting.
The manual gives these installation rules:
| Do | Don’t |
| Mount the thermostat at eye level | Do not install near a direct heat source |
| Read the instructions fully before use | Do not press hard on the LCD screen |
| Use the correct wiring diagram for the selected system type | Do not install without following local electrical rules |
The wiring diagrams also state that the product must only be installed by a qualified electrician and must comply with local installation regulations.
Parts and Controls
The neoStat-HC has a front LCD display with touch-sensitive keys below it.
Main Controls
| Control | Function |
| Left arrow | Moves through menu options |
| Tick key | Confirms selections and opens menu items |
| Right arrow | Moves through menu options |
| Down key | Lowers temperature, time, or setting values |
| Up key | Raises temperature, time, or setting values |
Main Menu Options
The lower display menu includes options such as:
- Power
- Mode
- Fan
- Hold
- Edit
- Holiday
- Setup
- Clock
- Cancel
The highlighted menu text shows the selected option.
LCD Display Icons and Indicators
The LCD display shows system status, mode, temperature, fan speed, and programming details.
| Display Item | Meaning |
| Mesh symbol | Shows connection to the neoHub |
| Window icon | Shows when a window or door switch is triggered |
| Frost icon | Shows frost protection or standby mode |
| Cool symbol | Shows cooling is active |
| Flame symbol | Shows heat demand; flashes during optimum start |
| Holiday icon | Shows holiday mode |
| Day indicator | Shows the day of the week |
| Until / Hold | Shows manual override or hold status |
| Mode indicator | Shows Auto, Heat, Cool, or Ventilation mode |
| Set icon | Shows when settings or set points are being changed |
| Program indicator | Shows which comfort period is being edited |
| Keypad lock icon | Shows keypad lock is active |
| Sensor warning | Flashes if a wireless sensor or window switch signal is missing |
| Temperature display | Shows room temperature in °C or °F |
| Fan icons | Show active fan speed or fan selection |
| Time/date display | Used for clock, calendar, or holiday settings |
Product Specifications
| Specification | Detail |
| Product model | Heatmiser neoStat-HC |
| Product type | Smart heat/cool thermostat and fan controller |
| Series | neo Stat Series |
| Mounting type | Flush mounted |
| Back box requirement | 35mm minimum depth |
| Power input | AC230V |
| Fan control | 3-speed fan: low, medium, high |
| Modes | Auto, Heat, Cool, Ventilation |
| Program modes | Non-programmable, weekday/weekend, 7 day, 24 hour |
| Temperature format | °C or °F |
| Frost protection range | 7°C to 17°C |
| Frost default | 12°C |
| Output delay | 00 to 15 minutes |
| Switching differential | 0.5°C, 1.0°C, 2.0°C, 3.0°C |
| Deadband range | 2°C to 10°C |
| Wireless connection | neoHub mesh network |
| RF frequency | 2.4GHz 3.54dBm |
| Compliance | Directive 2014/53/EU |
How to Install the Heatmiser neoStat-HC
The manual shows a four-step installation process.
Installation Steps
- Loosen the retaining screw
Use a small screwdriver to slightly loosen the screw from the bottom face of the thermostat. - Separate the front from the back plate
Carefully remove the front half of the thermostat from the back plate. - Place the front safely aside
Keep the thermostat front in a safe place while wiring. - Connect the wiring
Terminate the thermostat wiring according to the correct diagram for the selected system type. - Secure the back plate
Screw the thermostat back plate into the 35mm wall back box. - Clip the front back on
Fit the thermostat front onto the back plate and secure it with the retaining screw.
System Type Options
The System Type setting configures the thermostat operation and switched outputs for the installed heating/cooling setup.
System Type Table
| System Type | Description |
| 01 | 2 pipe system, manual heat or cool selection |
| 02 | 2 pipe system, cool only |
| 03 | 2 pipe system, manual heat or cool with twin valve output |
| 04 | 4 pipe system with heat, cool, and auto |
| 05 | 2 pipe system with cooling and 2-stage heating |
Key Terminal Terms
| Term | Meaning |
| NO | Normally open switch |
| NC | Normally closed switch |
| Hf | High fan speed |
| Mf | Medium fan speed |
| Lf | Low fan speed |
| V1 | Valve output 1 |
| V2 | Valve output 2 |
How to Select System Type
To choose the correct system type:
- Use the Left/Right keys to highlight the power icon.
- Press and hold the Tick key for 3 seconds to turn off the display.
- Press Tick to enter Setup.
- Press the Up key until feature 10 appears at the top right.
- Use Left/Right to select the required system type.
- Press Tick to confirm.
This setup step is important because the selected system type controls how heating, cooling, fan, and valve outputs operate.
Pairing the neoHub
The neoStat-HC can connect to the Heatmiser neoHub for smart app control.
neoHub Setup Steps
- Connect the neoHub to the router using the Ethernet cable.
- Connect the neoHub power supply.
- Download the neoApp.
- Register or sign in to an account.
- Select Add neoHub in the app.
- Follow the in-app setup instructions.
Once the neoHub is paired to the account, the next step is adding the neoStat-HC as a zone. The app will ask for a zone title and start a pairing countdown.
Pairing the neoStat-HC
To pair the thermostat with the neoHub:
- On the neoStat-HC, use Left/Right to select the power icon.
- Press and hold Tick.
- When SETUP is highlighted, press Tick once.
- Feature 01 appears.
- Press Tick again to pair the thermostat to the neoHub.
- The mesh symbol flashes on the display.
- When pairing succeeds, the mesh symbol stays permanently displayed.
The manual notes that the neoHub only needs to be paired to the account once. Additional neo devices can be added from the app using the Add Thermostat option.
What Is the Mesh Network?
Heatmiser neoStats use a mesh network. This means compatible neoStats can send and receive signals through other thermostats on the same network until the signal reaches its target.
This helps:
- Extend communication range
- Improve network stability
- Keep thermostats connected to the neoHub
If the mesh symbol disappears, the thermostat has lost connection to the neoHub.
Approach Sensor
The neoStat-HC includes an approach sensor. When someone moves close to the thermostat, the touch keys and backlight turn on automatically.
This makes the thermostat easier to use in darker rooms or low-light areas.
Temperature Display
The neoStat-HC normally shows the ambient room temperature. If wireless remote sensors are paired through the neoHub, the thermostat can show an averaged temperature between the thermostat and paired sensor.
View Set Temperature in Heat or Cool Mode
- Press Up or Down once.
- The set temperature appears.
- Press Tick to return to the main screen.
View Heat and Cool Set Temperatures in Auto Mode
- Press Up or Down once.
- The first set temperature appears based on the active mode.
- Press Tick to view the next set temperature.
- Press Tick again to return to the main screen.
The SET screen times out after 5 seconds if Tick is not pressed.
Power On and Off
The flame icon appears when heating is active. If the flame icon is absent, there is no heating demand, but the thermostat remains active.
Turn the Thermostat Off
- Scroll to the Power icon.
- Press and hold Tick for about 3 seconds.
- The display goes blank.
- Heating output turns off.
Turn the Thermostat Back On
Press Tick once.
Setting the Time and Date
To set the clock:
- Use Left/Right to scroll to the power icon.
- Press and hold Tick to turn off the display.
- Use the Right arrow to select CLOCK.
- Press Tick.
- Use Up/Down to set the year.
- Press Tick.
- Repeat for month, date, and time.
- Press Tick to confirm the new clock settings.
- Scroll back to the power icon.
- Press Tick to turn the display on.
Mode Select
The neoStat-HC can operate as a heating/cooling thermostat and fan ventilation controller. Available mode options depend on the selected system type.
Common modes include:
- Auto
- Cool
- Heat
- Ventilation
How to Select Mode
- Use Left/Right to scroll to MODE.
- Press Tick.
- Repeatedly press Tick to choose the required mode.
Fan Speed Control
The neoStat-HC supports manual and automatic fan control.
Manual Fan Speeds
- Low
- Medium
- High
Auto Fan Logic
In auto fan mode, the thermostat selects fan speed based on the difference between set temperature and actual room temperature:
| Temperature Difference | Fan Speed |
| 1°C / 2°F | Low fan |
| 2°C / 4°F | Medium fan |
| 3°C / 6°F | High fan |
How to Select Fan Speed
- Scroll to FAN.
- Press Tick.
- Repeatedly press Tick to select the fan speed.
Comfort Levels and Programming
The neoStat-HC supports three schedule formats and a manual mode:
| Program Mode | Description |
| Weekday/Weekend | Monday–Friday schedule and separate Saturday–Sunday schedule |
| 7 Day | Each day has its own comfort levels |
| 24 Hour | Same comfort levels every day |
| Non-programmable | Simple manual temperature control |
Default Heating Comfort Levels
| Period | Time | Temperature |
| Wake | 07:00 | 21°C |
| Leave | 09:00 | 16°C |
| Return | 16:00 | 21°C |
| Sleep | 22:00 | 16°C |
Default Cooling Comfort Levels
| Period | Time | Temperature |
| Wake | 07:00 | 23°C |
| Leave | 09:00 | 26°C |
| Return | 16:00 | 23°C |
| Sleep | 22:00 | 26°C |
Unused comfort levels should be set to –:–, so the thermostat skips them.
Setting the Comfort Levels
To program comfort levels:
- Scroll to EDIT.
- Press Tick.
- Use Left/Right to select the day or period of the week.
- Press Tick.
- When WAKE flashes, press Tick to edit.
- Use Up/Down to set the hour.
- Press Tick.
- Use Up/Down to set the minutes.
- Press Tick.
- Use Up/Down to set the temperature.
- Press Tick.
- Repeat the process for Leave, Return, and Sleep.
- Scroll to DONE.
- Press Tick to save.
In Auto mode, the thermostat asks for both Heat and Cool set points for each comfort level.
Manual Temperature Control
To adjust the current set temperature:
- Press Up or Down.
- The display shows SET and the desired temperature.
- Use Up/Down to adjust the value.
- Press Tick to confirm.
In Auto mode, both Heat and Cool temperatures must be set.
The manual notes that manual temperature changes remain active only until the next programmed comfort level. After that, the thermostat returns to the schedule.
Temperature Hold
Temperature Hold temporarily overrides the current program for a selected time.
How to Set Temperature Hold
- Scroll to HOLD.
- Press Tick.
- Use Up/Down to set the hold period.
- Press Tick.
- Use Up/Down to set the hold temperature.
- Press Tick.
The screen shows HOLD LEFT and the remaining hold time. When the countdown ends, the thermostat returns to the normal program.
Cancel Temperature Hold
- Scroll to HOLD.
- Press Tick twice.
Locking and Unlocking the neoStat-HC
The thermostat has a keypad lock with a four-digit PIN.
Lock the Thermostat
- Scroll to HOLD.
- Press and hold Tick for 10 seconds.
- The display shows 0000.
- Use Up/Down to enter the first two digits.
- Press Tick.
- Use Up/Down to enter the second two digits.
- Press Tick.
- The lock icon appears on the main screen.
Unlock the Thermostat
- Press Tick once.
- Enter the four-digit PIN using Up/Down and Tick.
- The thermostat unlocks and returns to the main display.
Frost Protection and Standby
To enable frost protection:
- Scroll to the Power icon.
- Press Tick.
- The frost icon turns on.
In frost protection mode, the thermostat turns heating on only when the room temperature drops below the frost protection temperature.
In cooling and ventilation mode, the thermostat goes into Standby instead.
Holiday Mode
Holiday mode lowers the heating set temperature to the frost protection temperature until a chosen return date and time.
Important Holiday Note
If the thermostat is left in Cool only mode, holiday mode places the thermostat into standby, so frost protection will not be available.
Set Holiday Mode
- Scroll to HOLIDAY.
- Press Tick.
- Set the year with Up/Down.
- Press Tick.
- Set the month, date, and time.
- Press Tick after each setting.
Holiday mode starts immediately and ends at the configured date and time.
Cancel Holiday Mode
- Scroll to HOLIDAY.
- Press Tick.
- When CANCEL is highlighted, press Tick.
Ventilation Mode
In ventilation mode, there is no heating or cooling output. Only fan control is active.
Ventilation mode is available in all system types and works manually.
Select Ventilation Mode
- Scroll to MODE.
- Press Tick.
- Repeatedly press Tick until Ventilation mode is selected.
Start, Stop, or Change Fan Speed
- Scroll to FAN.
- Repeatedly press Tick to select low, medium, high, or off.
Feature Menu Settings
The feature menu is used for initial setup and advanced configuration.
| Feature | Description | Settings |
| 01 | Pairing | Used to add zone to neoHub |
| 02 | Switching differential | 0.5°C, 1.0°C, 2.0°C, 3.0°C |
| 03 | Frost protection temperature | 7°C to 17°C |
| 04 | Output delay | 00 to 15 minutes |
| 05 | Up/down temperature limit | 00°C to 10°C |
| 06 | Optimum start | 00 to 05 hours |
| 07 | Rate of change | Minutes to raise temperature by 1°C |
| 08 | Program mode | Non-programmable, weekday/weekend, 7 day, 24 hour |
| 09 | Temperature format | °C or °F |
| 10 | System type | Types 01 to 05 |
| 11 | Deadband | 2°C to 10°C |
| 12 | Constant fan | Off / On |
| 13 | Cool air proof | Disabled or 5, 10, 15, 30, 60, 90 seconds |
| 14 | Valve cycling | Multiple weekly/monthly cycling options |
Feature Menu Highlights
Switching Differential
This controls how far the room temperature can drop before heating turns on again. For example, with a 1°C differential and a 20°C set temperature, heating turns on at 19°C and off at 20°C.
Deadband
Deadband applies in Auto heat/cool mode. It creates a gap between the heat and cool set points to stop heating and cooling from working against each other.
Constant Fan
When enabled, the fan runs between low, medium, and high during heat or cool demand. After demand ends, the fan continues at low speed. When disabled, the fan turns off after demand ends.
Cool Air Proof
This feature delays the fan when heating starts, giving the coil valve time to open before air starts blowing.
Valve Cycling
Valve cycling runs each valve for 5 minutes if the outputs have not operated within a set period. This helps keep valves moving after long idle periods.
How to Adjust Feature Menu Settings
- Scroll to the Power icon.
- Press and hold Tick for 3 seconds.
- When SETUP is highlighted, press Tick once.
- Use Up/Down to move through features.
- Use Left/Right to change the selected feature value.
- Press Tick to confirm and exit.
Re-Calibrating the Thermostat
The manual warns users to call Heatmiser support before recalibrating because incorrect calibration can cause the thermostat to operate incorrectly.
Re-Calibration Steps
- Scroll to the Power icon.
- Press and hold Tick to turn the display off.
- Press and hold Tick + Down together for 10 seconds.
- The current temperature appears.
- Use Up/Down to adjust the temperature value.
- Press Tick to confirm.
- Turn the thermostat back on.
Error Codes and Troubleshooting
The manual lists one main error code:
| Error Code | Meaning | What to Do |
| E0 | Internal sensor fault | Contact Heatmiser support or the installer |
Common Troubleshooting Tips
| Problem | Possible Cause | Recommended Action |
| No heat output | Thermostat may be off, in standby, or set temperature is reached | Check power status, mode, and flame icon |
| Cooling not active | Wrong mode or system type selected | Check Mode and Feature 10 System Type |
| Fan not running | Fan may be off, constant fan disabled, or mode does not use fan | Check FAN setting and system type |
| Keypad does not respond | Keypad lock is active | Enter the four-digit PIN |
| Mesh symbol disappears | neoHub connection is lost | Check neoHub power, router connection, and app pairing |
| Sensor warning flashes | Wireless sensor or window switch signal missing | Check paired sensor or switch connection |
| Holiday mode does not protect from frost | Thermostat may be in Cool only mode | Use the correct mode before setting holiday |
| Temperature reading seems wrong | Calibration may be incorrect | Contact support before recalibrating |
Wiring Diagram Summary
The manual includes multiple wiring diagrams for different system types.
Wiring Diagrams Included
| Diagram | System Type |
| Normally Closed Valve | System Types 01 and 02 |
| Normally Open Valve | System Types 01 and 02 |
| 3 Wire Valve Connection | System Types 01 and 02 |
| Fan Coil & Wet Systems | System Types 03 and 05 |
| Heat & Cool Valves | System Type 04 |
The diagrams show AC230V input, 3-speed fan connections, valve wiring, and terminal labels including N, Hf, Mf, Lf, V1, V2, and L. Each wiring diagram repeats that installation must be done by a qualified electrician and must follow local regulations.
Factory Reset
A factory reset clears all setup and pairing parameters. Setup and pairing must be repeated afterward.
Factory Reset Steps
- Scroll to the Power icon.
- Press and hold Tick to turn the display off.
- SETUP will be highlighted.
- Press and hold Tick for 10 seconds.
- All display icons appear for 2 seconds.
- The setup entry screen appears.
- Use Down to highlight the required option.
- Press Tick.
- The thermostat returns to the main display.
Support and Contact
Heatmiser provides support, technical specifications, PDFs, FAQs, and product resources through its official channels.
Heatmiser UK Ltd
Address:
Heatmiser UK Ltd
Units 1-5 Hurstwood Court, Mercer Way
Shadsworth Business Park, Blackburn
Lancashire, BB1 2QU
United Kingdom
Support phone: +44 (0)1254 669090
Website: www.heatmiser.com
The manual also states that Heatmiser UK Ltd declares the radio equipment is compliant with Directive 2014/53/EU. RF frequency is listed as 2.4GHz 3.54dBm.