The Sensi Touch Smart Thermostat is a Wi-Fi-enabled touchscreen thermostat designed for smart heating and cooling control through the Sensi mobile app. This installation guide applies to Sensi Touch Smart Thermostat models 1F95U-42WF series, ST75 series, NH-AWIFI, and OH-AWIFI.
The thermostat must be installed and configured using the Sensi app. The app helps users identify wires, confirm HVAC compatibility, connect the thermostat to Wi-Fi, register the device, and complete system setup.
A major installation requirement is the C-wire. The Sensi Touch requires a C-wire to power the touchscreen. Without a working C-wire connection, the display may stay blank or flash.
Supported Sensi Touch Models
| Product | Model Series |
| Sensi Touch Smart Thermostat | 1F95U-42WF series |
| Sensi Touch Smart Thermostat | ST75 series |
| Sensi Touch Smart Thermostat | NH-AWIFI |
| Sensi Touch Smart Thermostat | OH-AWIFI |
The model number can be checked on the back of the thermostat cover.
What You Need Before Installation
Before starting the installation, gather these items:
| Requirement | Purpose |
| 2.4GHz Wi-Fi network name/SSID | Needed for Wi-Fi setup |
| Wi-Fi password | Required to connect the thermostat |
| Screwdriver | Used to remove the old thermostat and mount the Sensi base |
| Included thermostat hardware | Used for wall mounting and installation |
| Sensi app | Required for setup, wiring guidance, and registration |
| C-wire | Required to power the Sensi Touch thermostat |
The manual states that the Wi-Fi network must be 2.4GHz. If the network does not appear during setup, it may be hidden or incompatible.
Downloading the Sensi App
The Sensi Touch thermostat is a Wi-Fi-enabled device, so installation starts in the Sensi app.
To begin:
- Download the Sensi app on a smartphone or tablet.
- Open the app.
- Create a Sensi account.
- Use a valid email address and password.
- Keep the login details safe because the thermostat will be linked to that account.
The manual notes that the “Install a device” option is only for HomeKit setup. Creating a Sensi account is recommended because users may lose available features without an account.
Creating a Sensi Account
A Sensi account is required for remote access and full thermostat features. After the app is downloaded, users are prompted to create an account using a valid email address and password.
If the password is forgotten later, select Forgot Password on the Sensi app login screen. A temporary password will be sent to the registered email address.
Sensi Touch Parts and Key Components
The manual focuses on installation and wiring, but it references these important thermostat components:
| Part or Component | Function |
| Touchscreen display/front cover | Main control screen for thermostat settings |
| Thermostat base/sub-base | Mounts to the wall and holds wire terminals |
| Wire terminal slots | Connect HVAC system wires |
| Paddle terminals | Secure wires inside the terminal slots |
| Built-in jumper | Replaces old jumper wires from the previous thermostat |
| RC/RH internal jumper | Used for transformer wiring; may need clipping on two-transformer systems |
| Backlight switch | Used during installation; should be turned off if controlling backlight from the display |
| Mounting screws | Secure the base to the wall |
| L terminal | Heat pump L terminal connection on supported systems |
The wiring diagram on page 11 shows the thermostat terminal layout for conventional systems and heat pump systems.
Important C-Wire Requirement
The Sensi Touch requires a C-wire to power the touchscreen. The manual explains that the thermostat may have a battery-powered light in the sub-base for installation, but that light lasts only about an hour and does not confirm that the thermostat itself has power.
If there is no wire in the C terminal, users should review Sensi’s C-wire support resources or contact a professional. For some heat-only systems, an external transformer may be an option.
How to Install the Sensi Touch Smart Thermostat
Step 1: Add the Thermostat to the Sensi App
After downloading the app and creating an account:
- Open the Sensi app.
- Tap the plus (+) sign.
- Select the Sensi Touch Smart Thermostat.
- Choose the correct model option.
The app will then begin the guided installation process.
Step 2: Choose the Installation Type
The app asks whether the thermostat is already mounted.
Not Mounted
Choose Not Mounted for a DIY installation. This option walks through the full process, including:
- Identifying old thermostat wires
- Labeling each wire
- Connecting wires to the Sensi base
- Configuring HVAC settings
- Connecting to Wi-Fi
The manual recommends this option for DIY users because it helps confirm proper wiring and configuration.
Is Currently Mounted
Choose Is Currently Mounted if the thermostat was professionally installed. This option asks users to identify already connected wires and then continues with system configuration and Wi-Fi setup.
Step 3: Remove the Old Thermostat
Before handling any thermostat wiring, turn off power to the heating and air conditioning system.
Then:
- Gather tools and package contents.
- Turn off HVAC power.
- Remove the old thermostat cover.
- Take a clear photo of the existing thermostat wiring.
- Remove and discard old jumper wires.
- Select the old thermostat wire terminals in the app.
- Confirm the app shows a valid configuration.
- Select the furnace type.
- Label each wire as it is removed.
- Disconnect the wires.
- Remove the old thermostat base from the wall.
The wiring photo is important because it can help with troubleshooting or technical support if something does not work after installation.
Step 4: Mount the Sensi Base
Use the provided mounting screws to secure the Sensi base to the wall.
Make sure:
| Installation Check | Why It Matters |
| Base is secure | Prevents loose thermostat fit |
| Wires are accessible | Makes terminal connection easier |
| Wall area is clean | Helps the base sit flat |
| Wire labels are visible | Reduces wiring mistakes |
Step 5a: Connect Wiring for a New Installation
For a Not Mounted installation:
- Insert each labeled wire into the matching terminal slot.
- Push the wire fully into the terminal.
- Check the paddle; if it does not go down, the wire may not be secure.
- Gently tug each wire to confirm it is locked in place.
- Push the front display onto the thermostat base.
- If the “Backlight” feature was used, make sure the switch is turned Off so it can be controlled from the display.
- Turn HVAC power back on.
Old jumper wires should not be reused because Sensi has a built-in jumper.
Step 5b: Setup for an Already Mounted Thermostat
If the thermostat is already mounted:
- Turn off HVAC power.
- Pull the thermostat cover straight toward you with both hands.
- Identify which terminals have wires attached.
- Confirm that a C-wire is installed.
- Select the furnace type.
- Push the thermostat cover back onto the base.
- Turn system power back on.
This route is mainly for professionally installed thermostats.
Step 6: Connect the Sensi Touch to Wi-Fi
After wiring and installation, connect the thermostat to Wi-Fi.
On the thermostat:
- Tap Menu.
- Tap Wi-Fi.
- Select the display option shown in the Sensi app.
- Follow the app’s step-by-step Wi-Fi instructions.
The Wi-Fi setup process may vary depending on:
| Factor | Possible Difference |
| Phone type | iOS or Android setup steps may differ |
| Sensi app version | Screens may look slightly different |
| Thermostat version | Different display options may appear |
For iPhone users, the manual notes that HomeKit-related errors may require checking app permissions and allowing access to Home Data.
Naming and Registering the Thermostat
After Wi-Fi connection:
- Choose a thermostat name or create a custom name.
- Register the thermostat.
- Use Locate Me or manually enter the address.
- Add street address, city, state, ZIP code, country, and time zone.
- Add contractor information if available.
- Tap Start Using Sensi.
Registration links the thermostat to the Sensi account and helps support app-based features.
HVAC Configuration Menu
The Sensi Touch includes HVAC configuration settings that can be checked from the physical thermostat.
| Menu Item | Description | Options |
| Outdoor Equipment | Select AC or heat pump and number of stages | AC1, AC2, HP1, HP2, None |
| Indoor Equipment | Select gas, electric, or fan-only equipment | GA1, GA2, EL1, EL2, Fan |
| Reversing Valve Position | Sets reversing valve operation or hydronic zone option | O, B, 6, None |
| Humidifier | Enables humidifier if wired to thermostat | Yes, No |
| Dehumidifier | Enables dehumidifier if wired to thermostat | Yes, No |
For most applications, the reversing valve is configured as O, which energizes in cooling. Some systems, such as certain Rheem or Ruud setups, use B, which energizes in heating.
Supported HVAC System Types
Conventional Single-Stage and Multi-Stage Systems
The wiring diagram on page 11 covers conventional systems without a heat pump.
These systems may include:
| Terminal | Function |
| RC | Power for cooling, 24V |
| RH | Power for heating, 24V |
| C | Common wire, 24V |
| Y | First-stage cooling |
| Y2 | Second-stage cooling or humidifier if configured |
| W/E | First-stage heat |
| W2 | Second-stage heat or dehumidifier if configured |
| G | Indoor blower fan |
| O/B | Heat pump changeover, zone panel, or 3-wire hot water zone valve |
| L | Heat pump L terminal connection |
For two-transformer systems with separate RC and RH wires, the manual states that the internal RC/RH jumper on the back of the thermostat should be clipped.
Heat Pump Systems
The heat pump wiring diagram on page 11 covers both single-stage and multi-stage heat pump systems.
| Terminal | Function |
| RC | Power for cooling, 24V |
| RH | Power for heating, 24V |
| C | Common wire, 24V |
| Y | First-stage heat and cool compressor |
| Y2 | Second-stage heat and cool compressor |
| W/E | Auxiliary or emergency heat |
| W2 | Additional auxiliary/emergency heat or dehumidifier depending on setup |
| G | Indoor blower fan |
| O/B | Heat pump reversing valve |
| L | Heat pump L terminal connection |
The thermostat includes an internal jumper between RC and RH on the back of the unit.
Installing Multiple Sensi Touch Thermostats
To install more than one Sensi thermostat:
- Install the first thermostat using the Sensi app.
- Open the Sensi app main screen.
- Tap the plus (+) sign.
- Add the next thermostat to the same account.
- Repeat the guided setup process.
Each thermostat should be installed and registered separately.
Accessing the Thermostat from Other Devices
Any device logged into the same Sensi account can control all thermostats registered to that account.
The manual warns users to be careful when sharing the Sensi account email and password. Anyone with those login details can access and control registered thermostats. There is no stated limit to the number of devices that can access the thermostat.
Troubleshooting the Sensi Touch Smart Thermostat
Wi-Fi Connection Problems
If the thermostat does not connect to Wi-Fi, try these steps:
| Issue | Recommended Fix |
| Outdated app | Update the Sensi app |
| Phone problem | Reboot the smartphone |
| Router problem | Unplug the router for a few minutes, then plug it back in |
| iPhone permissions | Turn on Keychain and allow Home Data |
| Location permissions | Turn on Location services |
| App permissions | Allow Location and Nearby Devices |
| Android mobile data issue | Turn off “Switch to mobile data,” “Smart Network Switch,” or “Avoid poor connections” |
| Setup issue | Try another smartphone or tablet |
For Android setup, the manual suggests turning off mobile data completely if the phone switches away from Wi-Fi during setup.
Reconnecting to Wi-Fi
If the router is replaced or the Wi-Fi password changes, the thermostat must be reconnected to Wi-Fi.
The reconnection process depends on the smart device being used. The manual directs users to Sensi’s support article for reconnecting the thermostat.
Blank or Flashing Display
If the touchscreen is blank or only flashes after installation, the thermostat is likely not receiving enough power.
The Sensi Touch requires a C-wire to power the thermostat.
If There Is No C-Wire
If no wire is connected to the C terminal, the manual recommends reviewing Sensi C-wire installation videos. For heat-only systems, users may be able to use an external transformer, but this should be handled carefully with official support guidance.
If a C-Wire Is Installed
If a C-wire is present but the thermostat still does not turn on:
- Confirm the C-wire is connected to the C terminal at the thermostat.
- Check that the same wire is connected to the C terminal at the HVAC control board.
- Gently tug the C-wire at the control board to confirm it is secure.
- Gently tug all thermostat wires to make sure they are seated in the sub-base terminal block.
- Use a voltmeter set to AC.
- Measure voltage between RH or RC and C.
- Confirm the thermostat receives 20–30VAC.
- Reset breakers if the power is already on.
If voltage is below 20VAC, the thermostat will not turn on.
Heating or Cooling Issues
If heating or cooling does not work correctly, check the HVAC configuration menu on the physical thermostat. Incorrect outdoor equipment, indoor equipment, reversing valve, or accessory settings can affect system operation.
Also check:
| Item | Why It Matters |
| HVAC power | System must have power |
| Breakers | Breakers may need reset |
| Wiring | Loose or incorrect wires can stop operation |
| C-wire | Required for thermostat power |
| Furnace type | Must match the actual heating source |
| Reversing valve | Must match heat pump configuration |
Account Settings and Password Help
Users can manage email preferences and account information inside the Sensi app.
| Device | How to Access Account Area |
| iOS | Tap the person icon in the upper-right corner |
| Android | Tap the three dots in the upper-right corner |
For forgotten passwords, use Forgot Password on the Sensi app login screen. A temporary password will be sent to the account email.
Technical Support
For installation problems, setup questions, Wi-Fi issues, or troubleshooting, users can contact Sensi support.
| Support Option | Details |
| Support website | sensihelp.com |
| Phone support | (888) 605-7131 |
| Compatibility help | sensi.copeland.com/en-us/compatibility |
| C-wire help | sensi.copeland.com/en-us/support/c-wire |