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nSpire Touch WiFi Programmable Thermostat (White) (UWG4-4999-MN)

nSpire Touch WiFi Programmable Thermostat (White) (UWG4-4999-MN)

Part Number: UWG4-4999-MNPast Model
Superseded by the UWG5-4999-WY.
The nSpire WiFi thermostat offers all the things you expect from a smart touchscreen thermostat – voice control (works with Hey Google and compatible with Amazon Alexa, adaptive control and intuitive operation.
This support page provides publications, manuals, specifications, videos, support articles, and common support questions
Need help? Call our experts at (800) 875-5285
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Support Questions

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The breaker and wire sizes are selected based on the total amperage of the WarmlyYours heating system connected to a single thermostat. This information is on the WarmlyYours heating system's installation plan, electrical plan, or UL label. Based on guidelines from the National Electrical Code: loads up to 16 Amps may utilize 12 gauge wire with a 20-Amp breaker, and loads up to 12 Amps - 14 gauge wire with a 15-Amp breaker. Local code and/or other factors may change these guidelines.

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In theory, it is possible, if no other options are available. We do not recommend it, but If the thermostat is controlling the floor temperature with a floor sensor, then it can go on an exterior wall. It is important that the floor sensor gets located in an area of the floor not hit by sunshine.

If the thermostat will be controlling the air temperature with the built-in ambient sensor, then it should go on an interior wall.

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A GFCI/GFEP (Ground Fault Circuit Interrupter / Ground Fault Equipment Protection) works differently than a circuit breaker by specifically detecting a small imbalance in electrical current between the hot and neutral wires, which indicates a potential ground fault (like a person touching a live wire), and instantly shutting off the power to prevent shock, while a circuit breaker only trips when there's a significant overload in current flow on the circuit, like a short circuit or too many appliances plugged in.

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The default is 10k. If this is a new installation, that is the answer. In the very rare occasion that this is replacing an older Energy stat (eg. square OJ Microline from before 2010 with red and green sensor wires), choose 12k. If this is a replacement for the other 99% of the thermostats WarmlyYours sold (Honeywell TH115 and TH111 thermostats), 10k is the value.

Always start with the default 10kΩ and change later if needed.

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Pressing and holding (2-3 sec) physical power/reset button will turn the unit completely OFF. Same process turns the unit back on.

(nHance and nJoin units will have the button on the front faceplate, nSpire Touch WiFi, nSpire Touch and nTrust will have the button on the right side of the faceplate.)

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The ground wire in the floor mat must be connected directly to the ground wire of the supply or to the house ground wire.

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Relays can fail due to excessive current or voltage. When a relay is exposed to too much current, the contacts can burn out. High voltage can also damage the coil. Other reasons include mechanical wear and tear, dust or dirt buildup, and moisture. These factors can cause the relay to malfunction or stop working entirely. Regular maintenance and using the relay within its specified limits can help prevent failures.

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Check the connections between the thermostat and power module. If the power module is connected incorrectly to the thermostat, the power module won't switch off.

USG Power Module Connection Diagram


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No, a circuit breaker will NOT protect against a power surge; a circuit breakers primary function is to protect against excessive current flow (overload), while a surge protector is specifically designed to handle voltage spikes, which are what power surges are considered to be.

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Please follow the interactive guide below:

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The flashing digits indicate that the actual (measured) floor temperature exceeds the thermostat temperature limit.

The temperature limit is set for either tile (104°F/40°C) or laminate (82°F/28°C) when the thermostat is first set up or re-configured.

For example: When the floor type (protection) is set to laminate, the limit defaults to 82°F/28°C. If the floor temperature goes above this - whether due to radiant floor heating or external heating sources, then the digits will flash and the heating is switched off.

Turning the temperature up or down will not affect the flashing digits. And leaving the thermostat alone with flashing digits does not harm the system.

Tip: To turn off the heated floor (ex. for months when it is not needed), on the outer edge of the thermostat, depress the lower right side button for 3-5 seconds. This will also turn it back on.

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Yes, the Touch and Wifi units will keep the time, there is a back up battery that will last quite a long time.  No need for resetting the clock in event of power outage.

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Yes, this model is dual-voltage and compatible with both 120V and 240V systems. However, ensure your supply voltage matches the voltage requirement of your specific floor heating element (e.g., do not connect 240V power to a 120V heating mat).

For a visual guide on these thermostats, you might find this video helpful:
... OJ Microline UWG4 and UDG4 Touch thermostats overview ...

This video details the features and installation concepts for the UWG4/AWG4 series, confirming its dual-voltage capabilities.

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Yes. The floor never free-runs — the thermostat’s floor sensor governs output, and you set a maximum floor temperature limit in the thermostat itself. Most heated tile bathroom floors are set between 80°F and 85°F. Set that limit during commissioning and record it on the handoff sheet so the homeowner does not raise it past the flooring manufacturer’s rated maximum.

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Yes, but the tear-out is the real risk. Scan the floor with thermal imaging before demo to map the existing hydronic tubing, and never fasten or drill into it. Keep the two systems on fully independent controls so they cannot fight each other, and do not place the electric floor sensor directly above a hydronic loop — the false-high reading will short-cycle the electric system. Call PRO technical support at 800-875-5285 to review the assembly before ordering.

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No. Electric floor heating cable is listed for installation under floor coverings only, and NEC 424.38(A) does not permit heating cable to be installed in walls. Running it vertically voids both the UL listing and the warranty. For warm towels and a little extra room heat, specify a heated towel rack, which is designed and listed for wall mounting.

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No, the RC-40AMP is controlled by a line voltage (120V/240V) thermostat.

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Yes, the floor sensor wire can be extended up to 300 feet with 18 AWG wire.

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No separate GFCI breaker is required — every WarmlyYours thermostat has a built-in Class A (5mA) GFCI. Stacking a GFCI breaker on top of it is one of the most common causes of nuisance tripping. Run a dedicated breaker sized to the load at 80% continuous duty: a 15A circuit carries up to 1,440W at 120V, a 20A circuit up to 1,920W. Loads beyond the thermostat’s 15A rating need a power module or relay.

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Yes the adaptive function is reset during a factory reset.

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See attached document for full description.  OJ App can be found on the App store under "UWG4".

https://www.warmlyyours.com/en-US/publications/NSPIRE-TOUCH-WIFI-SETTINGS-AND-REMOTE-CONTROL-SETUP-GUIDE-A.pdf

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Connecting to Amazon Alexa

Once a WiFi connection has been successfully setup and the OJ Microline UWG4 App associated with the thermostat, it can be connected to an Amazon Alexa home system.

  1. Open the Amazon Alexa App
  2. Click “+”
  3. Click “Device” from the "Add" screen
  4. Find and select “Thermostat" under “All Devices”
  5. Choose “Other” under "What Brand is Your Thermostat?"
  6. Select "WiFi" (it may search local WiFi for a short period)
  7. In the 3 options that follow, at bullet #3 select the "Smart Home Skills" link
  8. In Search field, type "UWG4"
  9. Select "UWG4 Thermostat" (If you get choices, Select UWG4)
  10. Select “Enable" to use
  11. Login withg your OJ Microline userid and password
  12. Select "Allow"
  13. It will then work to discover the Alex devices and enable the selection of the desired OJ Microline thermostat when complete

Your thermostat is now connected to the Amazon Alexa system!

Connecting to Google Assistant

Before setting up voice control for the thermostat, you need a Google account that has been connected to the Google Home App.

  1. Open the Google Hoome App on your smartphone or tablet
  2. At the top left, tap "Add" (+) - "Set up Device" - "Works with Google"
  3. Select the manufacturer of the device from the list. Search "UWG4" and select "UWG4 Smart Thermostat"
  4. Follow the in-app steps to complete setup:
  • Sign into the UWG4 app with your logion information
  • Read and accept the grants page
  • The thermostat should now appear as available to be linked to Google Home.
  • Choose the thermostatand click "Next" in the bottom right corner
  • Select a location for your thermostat and cleck "Next"

Your thermostat is now set up and you can try different voice commands using the thermostat name that you chose in the Google Home app.

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To unlock WarmlyYours nSpire Touch Programmable Thermostat from child lock mode: Connect the dots on the touch screen to make the letter "L".

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Forego the app because the password cannot reset there, and go to a web browser and to the website mythermostat.info   Once there, click 'Forgot password'.

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Login to mythermostat.info from a web browser to confirm account activation.  A password reset may be required and the web browser login is the only menu that allows this.  Assure the ONLINE, CONFIRMED, and LINKED statuses are all YES; activation succeeded.  You may now proceed to use the mobile device OJ Microline UWG4 app.  If activation did not succeed, contact WarmlyYours Technical support at (800) 875-5285 during normal business hours for assistance.

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This indicates a fault, current to ground. The thermostat has cut off the power for your safety. Please contact your local electrician or WarmlyYours Technical Support.

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Error code “E2” means the floor sensor is defective, damaged or not connected. Check the connections, and replace the sensor if needed. Test the sensor with a digital multimeter on the 20k scale. Because the sensor is a thermistor, its resistance changes with temperature: it typically reads about 8kΩ–15kΩ at normal room temperature, lower when warm and higher when cold. A reading of 0 ohms or OL (open line) indicates a failed sensor. Only one floor sensor can be connected to a thermostat.

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The best home features for cold climates include a simple gable roof to shed snow, covered entrances for protection, airtight triple-pane windows to prevent heat loss, and radiant heating systems. These features work together to maintain interior warmth, reduce energy bills by up to 25%, and ensure structural safety during harsh winters.

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If the radiant heating system is a WarmlyYours purchased radiant heating system, the Distributor ID is 10266

Otherwise, use Distributor ID 99887

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GFCI can fail for various reasons, such as wear and tear, moisture, corrosion, power surges, faulty wiring, or improper installation. Some of these causes can be prevented by regular inspection and maintenance, while others may require professional assistance. It is important to note that GFCI devices (ex. thermostat, breakers, outlets) should be tested regularly as these do wear out over time.

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A floor sensor measures floor temperature so a compatible thermostat can regulate comfort and enforce the flooring manufacturer’s temperature limit. Some thermostats, including nTrust 2.0, offer a regulator mode without a sensor, but that mode does not measure floor temperature. Use sensor-based temperature control whenever required by the flooring or heating-system instructions.

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Follow the on-screen instruction to reset the GFI by pressing the lower right side button.

If the unit continues to trip please contact Tech Support at +1 (800) 875-5285

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Specifications

Warranty / Certifications (UWG4-4999)

Approvals cULus listed
IC Certification Number 8595A-NINAW106
Ingress Protection (IPxx) Rating IP20
Warranty Limited 3-year warranty and lifetime technical support

Electrical (UWG4-4999)

Battery 5 year battery backup of clock and calendar
Connection 4 wires, double pole
Connection Method Hardwired
Ground Fault Protection GFCI, Class A, 5 mA
Maximum Current 15 A
Maximum Power 1800 W @ 120 V, 3120 W @ 208 V, 3600 W @ 240 V
Supply 120 VAC, 208 VAC, 240 VAC (50/60Hz)

Appearance (UWG4-4999)

Color White

Product Dimensions (UWG4-4999)

Depth 2″
Installed Depth 0.75″
Length 5.125″
Weight 0.6 lbs
Width 3.25″

Controls (UWG4-4999)

Display Backlit Display
Display Size 2″ W x 3″ H (3.5″ Diagonal)
Languages English, French, Spanish

Thermostat (UWG4-4999)

Floor Sensor Compatibility 10k ohms, 12k ohms and custom
Includes Floor Sensor 10k ohms, 15′ lead
Maximum Ambient Temperature Setting 77 °F
Maximum Floor Temperature Setting 104 °F
Minimum Ambient Temperature Setting 32 °F
Minimum Floor Temperature Setting 41 °F
Temperature Rise Limit in Laminate Floor Protection ~10°F/hr (~5.58°C/hr)

Connectivity (UWG4-4999)

Hardware Version Identification Number (HVIN) NINA-W106
Wi-Fi IEEE Standards 802.11 b/g/n
Wi-Fi Radio Frequency Bands 2.4 GHz
Works with Hey Google or Amazon Alexa

Identifiers (UWG4-4999)

SKU UWG4-4999
UPC (GTIN-12) 881308051242

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