Heatmiser neoStat PRO Smart Thermostat User Manual

The Heatmiser neoStat PRO is a smart thermostat from the IMI Heatmiser neoStat Series. It is designed for heating control, app-based programming through the neoHub, and optional remote probe support for floor and air sensing.

The official manual covers installation, neoHub pairing, mesh networking, approach sensor use, LED display icons, display options, temperature control, frost mode, holiday mode, optional settings, cooling and dew point control, recalibration, error codes, probe wiring, boiler wiring, UH8 wiring, and support details.

Key Features

The Heatmiser neoStat PRO includes:

• Smart thermostat control through neoHub and neoApp
• Flush-mounted design
• LED front display
• Mesh network communication
• Approach sensor with illuminated touch keys
• Ambient temperature or blank display option
• Heating control
• Cooling support when used with neoHub and HC-Switch
• Dew point protection for underfloor cooling
• Frost protection mode
• Holiday/away mode through neoApp
• Remote floor and remote air probe support
• Built-in sensor, floor sensor, or combined sensor options
• Boiler switched live, volt-free, valve, and UH8 wiring options
• Factory reset
• Error code display

Important Installation Notes

The neoStat PRO is designed to be flush mounted and requires a 35mm minimum depth back box.

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 LED panel
Use the correct wiring diagram	Do not block airflow around the thermostat

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

Parts and Controls

The neoStat PRO has a minimalist LED display with three touch keys.

Main Controls

Control	Function
Down key	Lowers temperature or setting values
Tick key	Confirms settings, enables frost mode, and supports pairing/reset actions
Up key	Raises temperature or setting values

Main Display Elements

Display Item	Meaning
Mesh symbol	Thermostat is connected to the neoHub
Dew point icon	Floor has reached dew point and cooling is stopped
Frost icon	Frost protection is enabled
Flame symbol	Thermostat is calling for heat
Snowflake icon	Cooling is active
Holiday icon	Holiday or away mode is active
Floor limit icon	Floor probe has reached the configured floor limit
Sensor warning	Wireless sensor or window/door switch signal has failed
SET	Set temperature is being changed
Temperature display	Shows current sensor temperature or set temperature
°C / °F	Shows selected temperature format
Touch keys	Used for temperature changes and frost protection

Product Specifications

Specification	Detail
Product model	Heatmiser neoStat PRO
Product type	Smart thermostat
Series	neoStat Series
Mounting type	Flush mounted
Back box depth	35mm minimum
Display type	LED display
App control	Heatmiser neoApp via neoHub
Network type	Heatmiser mesh network
Temperature format	°C or °F
Frost protection range	5°C to 17°C
Frost default	12°C
Output delay	00 to 15 minutes
Floor temperature limit	20°C to 45°C
Floor limit default	28°C
Probe type	NTC Thermistor 10K3A1
Remote probe inputs	RT1 and RT2 with negative terminal
Cooling support	Via neoHub and HC-Switch
RF frequency	2.4GHz 9.18dBm
Compliance	Directive 2014/53/EU

How to Install the Heatmiser neoStat PRO

Installation Steps

1. Loosen the retaining screw
   Use a small screwdriver to loosen the screw on the bottom face of the thermostat.
2. Separate the front from the back plate
   Carefully remove the front half from the back plate.
3. Place the front panel safely aside
   Keep the front panel protected while wiring and mounting.
4. Wire the thermostat
   Terminate wiring according to the correct diagram on pages 22–25 of the manual.
5. Secure the back plate
   Screw the back plate into the wall back box.
6. Refit the front panel
   Clip the front onto the back plate and secure it with the retaining screw.

Set Up and Pairing

The neoStat PRO becomes a programmable smart thermostat when paired with a neoHub. Without the neoHub, the manual notes that the unit works as a non-programmable thermostat.

Pairing the neoHub

To pair the neoHub with the neoApp:

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

Pairing the neoStat PRO

To pair the thermostat:

1. In the neoApp, select Add neoStat.
2. Enter a preset or custom title.
3. Press Next.
4. The app gives two minutes to join the thermostat to the neoHub.
5. On the neoStat PRO, hold the Tick + Up keys until the mesh symbol flashes.
6. When pairing succeeds, the mesh symbol stays permanently displayed.
7. The app confirms the connection.
8. Select Add Another for more zones or Finish to complete setup.

Additional neoStats can be added later from Zones > Edit > Add Zone.

What Is a Mesh Network?

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

This helps improve:

• Communication range
• Network stability
• Smart thermostat reliability

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

Approach Sensor

The neoStat PRO uses proximity sensing. When someone approaches the thermostat, the touch keys and backlight light up automatically.

This helps users adjust settings in low-light rooms without needing to press the panel first.

Display Options

The neoStat PRO can show either an ambient temperature display or a blank display. During keypad use, the display lights at full brightness, then dims or goes blank after a few seconds.

Display Settings

Setting	Display Behavior
01	Display on, brightness level 1 / medium
02	Display on, brightness level 2 / low
03	Display off / blank display default

How to Change Display Options

1. Hold the Tick key until 01, 02, or 03 appears.
2. Use Up/Down to select the desired option.
3. Press Tick to confirm.

Temperature Display

The neoStat PRO can be configured for:

• Built-in air sensor
• Floor sensor
• Air and floor sensor together

When both air and floor sensing are used, room temperature appears by default.

View Floor Temperature

Press and hold the Down arrow + Tick keys for 5 seconds. The floor temperature appears briefly, then the thermostat returns to room temperature display.

Comfort Levels and Programming

Programming is available through the neoApp when the thermostat is paired with a neoHub.

Program Modes

Program Mode	Description
Weekday/Weekend	Separate weekday and weekend comfort levels
7-Day	Each day can be programmed differently
24-Hour	Same comfort levels every day
Non-programmable	Manual temperature control only

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 levels should be set to –:– in the app.

Temperature Control

To adjust the set temperature manually:

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

When used as a programmable thermostat, this temperature change stays active only until the next programmed comfort level.

Frost Mode

Frost Mode protects the property from low-temperature conditions.

How Frost Mode Works

• The frost icon appears when enabled.
• Heating only turns on if the room temperature falls below the frost protection temperature.
• If heating starts during frost mode, the flame symbol appears.

Enable or Disable Frost Mode

Press Tick. The frost icon toggles on or off each time the key is pressed.

Holiday Mode

Holiday mode is controlled through the neoApp.

In thermostat mode, holiday mode reduces the set temperature to the frost protection temperature. The thermostat maintains that temperature for the holiday period and then returns to the normal program.

Unlocking the neoStat PRO

The lock PIN is set through the app.

Unlock Steps

1. Press Tick once.
2. The display shows 00.
3. Use Up/Down to enter the first two digits.
4. Press Tick.
5. Use Up/Down to enter the second two digits.
6. Press Tick.
7. The thermostat unlocks and returns to the main screen.

Factory Reset

To reset the device to factory default settings:

1. Hold all three keys together.
2. Keep holding until every icon appears on the display.
3. The reset process restores the thermostat to factory settings.

Optional Settings

Many optional settings are only active or accessible after the thermostat is paired to a neoHub system.

Setting	Purpose
Switching differential	Changes the temperature difference before heating switches on/off
Frost protect temperature	Sets frost mode temperature from 5°C to 17°C
Output delay	Delays output by 00 to 15 minutes to reduce rapid switching
Temperature up/down limit	Limits local temperature adjustment range
Sensor selection	Selects air, floor, or combined sensor operation
Dew point	Stops cooling if the floor approaches dew point
Floor temp limit	Limits floor temperature between 20°C and 45°C
Cool enable	Allows active cooling when the system is in cooling mode
Optimum start	Starts heating at the latest possible time to reach target temperature
Rate of change	Shows minutes needed for 1°C temperature rise
Program mode	Sets non-programmable, weekday/weekend, 7-day, or 24-hour mode
Temperature format	Selects °C or °F

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

Cooling and Dew Point

When used with a neoHub and HC-Switch, the neoStat PRO can be used for underfloor cooling.

In cooling mode:

• The snowflake icon shows cooling is active.
• A floor sensor must be fitted.
• The thermostat uses air, floor, and humidity sensors to calculate dew point.
• When the floor approaches dew point, cooling stops.
• This helps prevent condensation on tiled floors.

By default, cooling is disabled. When the system is set to cooling mode while cooling is disabled, dashes appear on the display. Cooling can be enabled from zone settings in the app.

Re-Calibrating the Thermostat

Recalibration changes the temperature offset.

Recalibration Steps

1. Press and hold Up + Down for 10 seconds.
2. The Tick key blinks once.
3. Use Up/Down to change the offset.
4. Tap Tick to store the value and return to the main display.

To remove a previously stored offset, perform a complete factory reset.

Error Codes

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
E2	Remote air probe not connected, wired incorrectly, or faulty	Check remote air probe wiring

Remote Probe Connections

The neoStat PRO supports up to two remote probe connections:

Probe	Type	Terminals
Remote floor sensor	NTC Thermistor 10K3A1	RT1 and negative
Remote air thimble sensor	NTC Thermistor 10K3A1	RT2 and negative

The thermostat automatically detects and uses remote probe connections. The manual warns that if a probe connection is incorrect and the device is not paired to a neoHub, a factory reset is required after correcting the wiring.

Wiring Diagram

The official manual includes several wiring diagrams.

Wiring Diagrams Included

Wiring Diagram	Purpose
neoStat to Boiler S/L	Switched live boiler connection
neoStat to Boiler Voltfree	Volt-free boiler room thermostat connection
neoStat to Valve	Heating valve connection
neoStat to UH8 and optional remote probes	UH8 connection with remote air and floor probes

Terminal Labels

The diagrams include terminals such as:

• RT2
• RT1
• –
• A2
• A1
• N
• L

The boiler wiring diagrams note that installers should refer to the boiler manufacturer’s wiring diagram before connecting the boiler. The diagrams also state that the product must only be installed by a qualified electrician and must follow local installation regulations.

Troubleshooting Guide

Problem	Possible Cause	What to Do
Mesh symbol disappears	neoHub connection lost	Check neoHub power, router connection, and app pairing
Display remains blank	Display option may be set to off	Change display option from 03 to 01 or 02
Heating does not turn on	Set temperature may already be reached	Check flame icon and raise set temperature
Cooling shows dashes	Cooling is disabled	Enable cooling in the neoApp zone settings
Cooling stops unexpectedly	Dew point protection is active	Check floor sensor and dew point status
Floor limit icon appears	Floor temperature limit reached	Check floor temperature limit setting
E0 appears	Internal sensor fault	Contact support
E1 appears	Floor probe issue	Check RT1 and negative terminal wiring
E2 appears	Air probe issue	Check RT2 and negative terminal wiring
Thermostat will not unlock	PIN required	Enter the four-digit PIN set in the app
Wrong temperature shown	Calibration offset may be incorrect	Recalibrate or factory reset to clear offset

Support and Contact

IMI Heatmiser provides product support, PDFs, FAQs, videos, and technical specifications.

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 9.18dBm.

Official User Manual(PDF)