Heatmiser neoStat V3 Smart Thermostat User Manual

The Heatmiser neoStat 12V V3 is a 12V smart programmable thermostat from the IMI Heatmiser neo Series. It can work in two main modes: Thermostat Mode for temperature control and Time Clock Mode for timed output control.

The official manual covers installation, mode selection, neoHub pairing, mesh networking, clock setup, comfort levels, temperature hold, frost protection, holiday mode, optional features, sensor probe setup, wiring diagrams, time clock programming, factory reset, error codes, and support details.

What Is a Programmable Room Thermostat?

A programmable room thermostat works as both:

Function	Purpose
Programmer	Sets when heating should turn on and off
Room thermostat	Measures room temperature and controls heating based on the set temperature

The manual explains that setting the thermostat to a higher temperature does not heat the room faster. Heating speed depends on the heating system design and size. A better approach is to find the lowest comfortable temperature and let the thermostat manage heating automatically.

Key Features

The Heatmiser neoStat 12V V3 includes:

• 12V smart thermostat operation
• Thermostat mode and time clock mode
• neoHub and neoApp pairing
• Mesh network communication
• Approach sensor with backlit touch keys
• Built-in, remote air, and floor sensor options
• Programmable comfort levels
• Weekday/weekend, 7-day, and 24-hour scheduling
• Non-programmable mode
• Temperature hold
• Frost protection
• Holiday mode
• Keypad lock with PIN
• Floor temperature limit
• Floor probe type selection: 10K, 12K, or 15K
• Factory reset
• UH8-N wiring compatibility

Important Installation Notes

The neoStat 12V V3 is designed for flush mounting and requires a wall back box with a minimum depth of 35mm.

Installation Do’s and Don’ts

Do	Don’t
Mount the thermostat at eye level	Do not install near a direct heat source
Read the full instructions before setup	Do not press hard on the LCD screen
Follow the wiring diagram carefully	Do not block airflow around the thermostat

The manual states that the product must only be installed by a qualified electrician and must comply with local installation regulations.

Parts and Controls

The neoStat 12V V3 has a square display with touch-sensitive controls.

Main Controls

Control	Function
Left arrow	Scrolls through menu options
Tick key	Confirms selections and enters menus
Right arrow	Scrolls through menu options
Down key	Lowers values such as temperature, time, or settings
Up key	Raises values such as temperature, time, or settings

Main Menu Options

Depending on the selected mode, the screen may show:

• Power
• Setup
• Clock
• Hold
• Holiday
• Edit
• Cancel
• Done

Product Specifications

Specification	Detail
Product model	Heatmiser neoStat 12V V3
Product type	12V smart programmable thermostat
Series	neo Series
Mounting type	Flush mounted
Back box depth	35mm minimum
Operating modes	Mode 1 Thermostat, Mode 2 Time Clock
Default mode	Thermostat mode
Power/control system	12VDC through UH8-N
Compatible wiring centre	UH8-N
Sensor options	Built-in sensor, remote air sensor, floor sensor, built-in + floor, remote air + floor
Supplied floor probe	10K floor sensor probe
Compatible probe values	10K, 12K, 15K
Floor temperature limit	20°C to 45°C
Floor limit default	28°C
Frost protection range	7°C to 17°C
Frost default	12°C
Switching differential	0.5°C, 1.0°C, 2.0°C, 3.0°C
Output delay	00 to 15 minutes
Program modes	Non-programmable, weekday/weekend, 7 day, 24 hour
Temperature format	°C or °F
RF frequency	2.4GHz 3.54dBm
Compliance	Directive 2014/53/EU

How to Install the Heatmiser neoStat 12V V3

Installation Steps

1. Loosen the retaining screw
   Use a small screwdriver to slightly loosen the screw from the bottom face of the thermostat.
2. Separate the front from the back plate
   Carefully remove the thermostat front from the back plate.
3. Place the front section safely aside
   Keep the front part protected while mounting and wiring.
4. Connect the wiring
   Terminate the thermostat wiring according to the wiring diagram. For thermostat wiring, use the diagram on page 29 of the manual. For time clock mode wiring, use the diagram on page 36.
5. Secure the back plate
   Screw the back plate into the wall back box.
6. Refit the thermostat front
   Clip the front onto the back plate and secure it with the retaining screw.

Mode Select: Thermostat or Time Clock

The neoStat 12V V3 can be used in two modes:

Mode	Function
Mode 1	Thermostat
Mode 2	Time Clock

Thermostat mode is the default setting.

How to Change Mode

1. Use Left/Right to scroll to the power icon.
2. Press and hold Tick for 3 seconds.
3. When SETUP appears, press and hold Tick for 10 seconds.
4. Use Left/Right to choose the mode.
5. Select:
   • Mode 1 = Thermostat
   • Mode 2 = Time Clock
6. Press Tick to confirm.

The thermostat returns to the main screen for the selected mode.

Pairing the neoHub

The neoHub connects the thermostat to the Heatmiser neoApp.

neoHub Pairing Steps

1. Connect the neoHub to the router using the supplied Ethernet cable.
2. Connect the neoHub power supply.
3. Wait for the router to assign an IP address.
4. The Link LED turns red when connected to the network.
5. The Link LED turns green when connected to the Heatmiser cloud server.
6. Connect the phone or tablet to the same Wi-Fi network.
7. Download the Heatmiser neoApp from the Apple App Store or Google Play.
8. Register an account.
9. Sign in and select Add Location.
10. Press the connect button on the neoHub.
11. Enter a location title, such as Home.

Pairing the neoStat 12V V3 with neoHub

The manual recommends pairing the neoStat closest to the neoHub first.

Pairing Steps

1. In the neoApp, select Add neoStat.
2. Enter a preset or custom title.
3. Press Next.
4. On the neoStat, select the power icon.
5. Press and hold Tick.
6. When SETUP is highlighted, press Tick once.
7. Feature 01 appears.
8. Press Tick again to pair the neoStat to the neoHub.
9. The mesh symbol flashes.
10. Once connected, the mesh symbol stays permanently displayed.

To add more zones, select Add Another in the app or use Zones > Edit > Add Zone.

What Is a Mesh Network?

Heatmiser neoStats use a mesh network. This means neoStats can send and receive signals through other thermostats on the network until the signal reaches the neoHub.

This improves:

• Wireless range
• Network reliability
• Communication stability

If the mesh symbol disappears, the thermostat has lost connection to the neoHub.

Approach Sensor

The neoStat uses proximity detection. When someone approaches the thermostat, the touch keys and backlight illuminate automatically.

This helps users adjust the temperature, time, or timer settings in a dark room.

Mode 1: Thermostat Mode

Thermostat mode controls heating based on temperature, comfort levels, and sensor settings.

LCD Display in Thermostat Mode

Display Item	Meaning
Mesh symbol	Connected to neoHub
Day indicator	Shows day of the week
Frost icon	Frost protection is active
Flame symbol	Heating demand is active; flashes during optimum start
Holiday icon	Holiday mode is active
Floor limit symbol	Floor probe has reached the configured floor limit
Floor/Room Temp	Shows active displayed sensor mode
Set	Current set point is being changed
Program indicator	Shows active comfort level during programming
Main menu	Shows selected menu option
Keypad lock	Keypad is locked
Temperature	Shows current sensor temperature
Temperature format	°C or °F
Hold Left	Temperature hold is active
Time/Day/Month/Year	Used for clock, calendar, and holiday setup

Temperature Display and Sensor Options

The neoStat can be configured to use:

• Built-in air sensor
• Remote air sensor
• Floor sensor only
• Built-in sensor and floor sensor
• Remote air sensor and floor sensor

The screen shows either Room Temp or Floor Temp depending on the sensor mode.

When both air and floor sensors are used, room temperature appears by default. To view the current floor temperature, press and hold the Left and Right arrow keys for 5 seconds.

Setting the Clock

1. Use Left/Right to scroll to the power icon.
2. Press and hold Tick to turn off the display.
3. Use the Right arrow to select CLOCK.
4. Press Tick.
5. Use Up/Down to set the year.
6. Press Tick.
7. Repeat for month, date, and time.
8. Press Tick to save.
9. Use the Down arrow to scroll back to the power icon.
10. Press Tick to turn the display on.

Comfort Levels and Programming

The neoStat supports these program modes:

Program Mode	Description
Weekday/Weekend	One schedule for weekdays and another for weekends
7 Day	Each day can have its own schedule
24 Hour	Same schedule every day
Non-programmable	Manual temperature control only

When thermostats are connected to the mesh network, program mode is configured through the neoApp.

Default 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

Unused comfort levels should be set to –:–.

How to Set Comfort Levels

1. Scroll to EDIT.
2. Press Tick.
3. Use Left/Right to select the day or period.
4. Press Tick.
5. When WAKE flashes, press Tick.
6. Use Up/Down to set the hour.
7. Press Tick.
8. Use Up/Down to set the minutes.
9. Press Tick.
10. Use Up/Down to set the temperature.
11. Press Tick.
12. Move to LEAVE and repeat the same steps.
13. Repeat for all comfort levels.
14. Set unused periods to –:–.
15. Scroll to DONE and press Tick.

Temperature Control

To change the set temperature manually:

1. Press Up or Down.
2. The screen shows SET and the desired temperature.
3. Use Up/Down to adjust the value.
4. Press Tick to confirm.

This new temperature remains active until the next programmed comfort level. Then the thermostat returns to the programmed schedule.

Temperature Hold

Temperature Hold overrides the current program for a chosen duration.

How to Set Temperature Hold

1. Scroll to HOLD.
2. Press Tick.
3. Use Up/Down to set the hold period.
4. Press Tick.
5. Use Up/Down to set the hold temperature.
6. Press Tick.

The display shows HOLD LEFT and the remaining time. When the hold period ends, the thermostat returns to the normal program.

Cancel Temperature Hold

With HOLD selected on the main menu, press Tick, then press Tick again while Cancel is highlighted.

Locking and Unlocking the neoStat

The neoStat includes a keypad lock with a four-digit PIN.

Lock the neoStat

1. Scroll to HOLD.
2. Press and hold Tick for 10 seconds.
3. The display shows 0000.
4. Use Up/Down to enter the first two digits.
5. Press Tick.
6. Use Up/Down to enter the second two digits.
7. Press Tick.
8. The keypad lock icon appears.

Unlock the neoStat

1. Press Tick once.
2. Enter the four-digit PIN using Up/Down and Tick.
3. The display unlocks and returns to the main screen.

Frost Mode

Frost mode helps protect the property from low-temperature conditions.

How Frost Mode Works

• The frost icon appears on screen.
• Heating only turns on if the room temperature drops below the frost protection temperature.
• The flame symbol appears if heating is active.

Enable or Disable Frost Mode

1. Scroll to the Power icon.
2. Press Tick.
3. The frost icon toggles on or off each time Tick is pressed.

Power On and Off

The flame icon shows active heat demand. If the flame icon is absent, heating is not required, but the thermostat remains active.

Turn Off Completely

1. Scroll to the Power icon.
2. Hold Tick for about 3 seconds.
3. The display goes blank.
4. Heating output turns off.

Turn On

Press Tick once.

Holiday Mode

In thermostat mode, Holiday mode reduces the set temperature to the frost protection temperature. In time clock mode, Holiday mode keeps the timed output OFF.

Set Holiday Mode

1. Scroll to HOLIDAY.
2. Press Tick.
3. Use Up/Down to set the year.
4. Press Tick.
5. Set the month, date, and time.
6. Press Tick to confirm each step.

The holiday period starts immediately and ends at the configured time and date.

Cancel Holiday Mode

1. Scroll to HOLIDAY.
2. Press Tick.
3. When CANCEL appears, press Tick.

Optional Thermostat Features

Feature	Description	Settings
01	Pairing to neoHub	Adds 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	Sensor selection	Built-in, remote air, floor, built-in + floor, remote air + floor
07	Floor temperature limit	20°C to 45°C
08	Optimum start	00 to 05 hours
09	Rate of change	Minutes to raise by 1°C
10	Not used	Not used
11	Not used	Not used
12	Program mode	Non-programmable, weekday/weekend, 7 day, 24 hour
13	Temperature format	°C or °F

Important note: the manual states that the neoStat 12V must not be used to control electric underfloor heating.

How to Adjust Optional Settings

1. Use Left/Right to scroll to the power icon.
2. Press and hold Tick for 3 seconds.
3. When SETUP appears, press Tick once.
4. Use Up/Down to scroll through features.
5. Use Left/Right to adjust the selected setting.
6. Press Tick to confirm and exit.

Re-Calibrating the Thermostat

Re-Calibration Steps

1. Scroll to the Power icon.
2. Press and hold Tick to turn the display off.
3. Press and hold Tick + Down together for 10 seconds.
4. The current temperature appears.
5. Use Up/Down to set the new temperature value.
6. Press Tick to confirm.
7. Use the Down arrow to highlight the power icon.
8. Press Tick once to turn the thermostat on.

Error Codes

The thermostat screen displays error codes when faults are detected.

Error Code	Meaning	Recommended Action
E0	Internal sensor fault	Contact support or installer
E1	Remote floor probe not connected, wired incorrectly, or faulty	Check floor probe wiring and probe type
E2	Remote air probe not connected, wired incorrectly, or faulty	Check remote air probe wiring

Floor Temperature Sensor Probe Type

The neoStat 12V is supplied with a 10K floor sensor probe and is also compatible with 12K and 15K probes.

How to Change Probe Type

1. Scroll to the power icon.
2. Press and hold Tick to turn the display off.
3. Press and hold Up + Down together for 5 seconds.
4. Use Left/Right to choose:
   • 10 = 10K probe
   • 12 = 12K probe
   • 15 = 15K probe
5. Press Tick to confirm.

The manual states this change should only be carried out by an experienced technician who has verified the probe value being used.

Wiring Diagram

The neoStat 12V connects to the UH8-N wiring centre. The UH8-N supports up to eight 12V thermostats or timers.

Thermostat Mode Wiring

The wiring diagram shows:

• 12VDC supply
• UH8-N connection
• Optional floor probe
• Optional remote air probe
• Terminals including RT2, RT1, -, A2, A1, +

The manual recommends CAT5-FTP or BELDEN 9538 for network devices connected to the UH8-N and instructs installers to connect the screen to S/Earth at the UH8-N.

Factory Reset

Factory reset clears all setup and pairing parameters. After reset, setup and pairing must be repeated.

Factory Reset Steps

1. Scroll to the power icon.
2. Press and hold Tick to turn the display off.
3. SETUP appears.
4. Press and hold Tick for 10 seconds.
5. All icons appear for 2 seconds.
6. The number 1 or 2 flashes.
7. Use Left/Right to choose:
   • Mode 1 = Thermostat
   • Mode 2 = Time Clock
8. Press Tick to confirm.

Mode 2: Time Clock Mode

In Time Clock Mode, the neoStat 12V controls timed output instead of temperature-based heating.

LCD Display in Time Clock Mode

Display Item	Meaning
Mesh symbol	Connected to neoHub
Day indicator	Shows day of the week
Holiday icon	Time clock is in holiday mode
Set	Settings are being changed
Program indicator	Shows switching period being edited
Main menu	Shows selected option
Keypad lock	Keypad is locked
Timer status	Shows current timed output state
Hold Left	Timer hold is active
Time/Day/Month/Year	Used for clock, calendar, and holiday setup

Setting Switching Times in Time Clock Mode

1. Scroll to EDIT.
2. Press Tick.
3. Use Left/Right to select the day or period.
4. Press Tick.
5. Switching time 1 flashes and the current ON time appears.
6. Press Down to view the OFF time.
7. Select a switching time and press Tick.
8. Set ON hours with Up/Down, then press Tick.
9. Set ON minutes, then press Tick.
10. Set OFF hours, then press Tick.
11. Set OFF minutes, then press Tick.
12. Press the Right arrow to move to switching time 2.
13. Repeat for all periods.
14. Set unused periods to –:–.
15. Scroll to DONE and press Tick.

Timer Override

Timer Override turns the timed output on for a selected duration.

How to Use Timer Override

1. Use Up/Down to set the override duration, such as 02:00 hours.
2. Press Tick to confirm.
3. The display returns to the main screen.
4. Hold Left and remaining time appear on the display.

Time Clock Optional Features

Feature	Description	Settings
01	Pairing to neoHub	Used to connect the time clock to neoHub
02	Program mode	Weekday/weekend, 7 day, or 24 hour

Time Clock Programming Modes

Mode	Description
Weekday/Weekend	4 ON/OFF switching times for weekdays and 4 for weekends
7 Day	Each day has 4 ON/OFF switching times
24 Hour	All days use the same ON/OFF switching times

Time Clock Mode Wiring

Time clock mode also connects to the UH8-N wiring centre. The same network wiring guidance applies:

• UH8-N supports up to eight 12V thermostats/timers.
• Use CAT5-FTP or BELDEN 9538.
• Connect the cable screen to S/Earth at the UH8-N.
• Installation must be completed by a qualified electrician.

Troubleshooting Guide

Problem	Possible Cause	Recommended Action
Mesh symbol disappears	neoHub connection lost	Check neoHub power, router connection, and app pairing
Heating does not turn on	Room temperature may already be above set point	Check flame icon and set temperature
Floor temperature limit appears	Floor probe has reached configured limit	Check Feature 07 floor limit
Buttons do not respond	Keypad lock is active	Unlock with the four-digit PIN
E0 appears	Internal sensor fault	Contact support
E1 appears	Floor probe issue	Check probe wiring and probe type
E2 appears	Remote air probe issue	Check remote air probe wiring
Time clock output stays off	Holiday mode or schedule issue	Check holiday mode and switching times
Temperature reading seems inaccurate	Calibration may need adjustment	Use recalibration steps carefully
Probe value is wrong	Incorrect floor probe type selected	Confirm probe value and set 10K, 12K, or 15K

Support and Contact

IMI Heatmiser provides support, technical specifications, PDFs, FAQs, and online resources.

IMI Heatmiser Support

Support phone: +44 (0)1254 669090
Website: www.heatmiser.com

Address:
IMI Heatmiser
Units 1-5 Hurstwood Court, Mercer Way
Shadsworth Business Park, Blackburn
Lancashire, BB1 2QU
United Kingdom

The manual states that Heatmiser UK Ltd declares the radio equipment complies with Directive 2014/53/EU. RF frequency is listed as 2.4GHz 3.54dBm.

Official User Manual(PDF)