Floor Heating Thermostats

While WarmlyYours electric radiant floor heating systems are typically installed by your floor covering contractor, a licensed electrician is recommended for the final thermostat hook-up. With every quote, we provide an Installation Plan layout, together with an electrical plan that has all the info required for the electrician.

You can use the Instant Quote Tool, which gives you many options for your floor heating coverage. Use this interactive tool to design your room online and receive an instant quotation with product recommendations, rough-in and installation kits, cost of your control, etc. Planning your floor heating project is made easy when using our Instant Quote Tool.

Send us your floor plan or fax it to (800) 408-1100 and we will send you a quote, product recommendation and a free custom installation plan for your project.

How to figure out the Kilowatt Load usage for your WarmlyYours floor heating system?

On the new touchscreen thermostat UDG4-4999, during the startup menu, users will be prompted to enter their KW load usage. Floor Load is the total wattage of the floor heating system that can be found on the installation or electrical plan. A lot of our customers may not know this for a number of reasons (they did not install or order the floor, it may be a replacement, and info on the installation has been lost, etc.) Here is an easy way to help out and get the Kilowatt load they need for this menu step.

Kilowatt load usage can be figured by taking the square footage of the open floor space multiplied by 15 (for tile) or 12 (for carpet and laminate). This gives us the total wattage which we then divide by 1000 to get the Kilowatts.

An example: the user has a 100-square-foot room that is tiled. The math would look like this: 100 sq feet X 15 watts per square foot = 1500 divided by 1000 = 1.5 KW

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.

No, floor heating thermostats are not compatible with the towel warmers. We would also not recommend using both devices on the same control, as it does not take the same amount of time to reach the ideal temperature for each product, which could lead to one unit to overheat and the other to not function properly.

Off-mode means that Mysa thermostat won't be sending power to the floor heaters. The Mysa thermostat will still be on but won't be turning the heaters on. This setting can be enabled on the Mysa thermostat itself or in the Mysa app.
On the Mysa thermostat: Hold down the down arrow until you see three dots on the display. Let go of the down arrow. The thermostat is now in off mode.
In the Mysa app: Tap the tile of the Mysa thermostat you'd like to turn off. Press the icon in the bottom left corner and a pop-up menu should appear. Tap off-mode, which is visually represented by a plug.

The H2 error is a result of the Mysa brand thermostat sensing an open heating circuit. To complete the heater circuit:

• The Mysa’s LOAD 1 connection must make contact with one heater connection;
• And the Mysa’s LOAD 2 (N) wire must make contact with the other heater connection.  There is no polarity in WarmlyYours heating elements.

If these connections are good, please test the heater circuit with a digital ohm meter. 

Here is the guide for single conductor heating systems:  https://www.warmlyyours.com/en-US/publications/OHM-READING-30032-A

Here is the guide for twin conductor systems:  https://www.warmlyyours.com/en-US/publications/TZ-TWIN-OHM-READING-30033-A

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.

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.

Press the MOD/RET button. Manual is indicated with a hand icon, and Automatic is indicated with a clock icon.

WarmlyYours's floor heating thermostats are typically universal and can be used with the majority of electric floor heating systems as a new or replacement controller. Please review the electrical specs of both the thermostat and the heating system to ensure a proper match for the heating system, sensor, etc. You can also give us a call at (1-800-875-5285) and we can help answer any remaining questions. 

When the ground fault protection mechanism trips, the TEST light is On (red). To reset the ground fault protection, switch the thermostat to Off and back to On. The TEST light will turn off.

Press on the door for 3 seconds until 'MAN' is shown on the display. Press on the door for 3 seconds until 'AUTO' is shown on the display.

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.

Lift up the bottom of the door of the T1033 using a small screwdriver.

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.

If your thermostat is blank, the first thing to do is to test to see if voltage is present at the rear of the thermostat. Verify that the power module power switches are in the ON position. Test for 12VDC across the 12VDC screw and the GROUND screw at the back of the thermostat. Here is a wiring diagram: https://www.warmlyyours.com/en-US/publications/MASTER-THERMOSTAT-W-POWER-MODULES-WIRING-DIAGRAM-B.pdf
If no power is reaching the thermostat, please test for 12VDC across the 12VDC and GND output at the front of power module base that is supplying power to the thermostat (the faceplate must be installed). If no power is present there, please inspect the circuit breaker in the breaker panel powering the power modules, and verify that the breaker is a non-GFCI type. If it is a GFCI breaker, replace it with a non-GFCI breaker. If there is power entering the thermostat and it is blank, it will need to be replaced. If power is getting to the power module and there is no 12VDC output to thermostat, the power module will need to be replaced.

Set the COMFORT temp of the final period of the day starting at the desired time with the corresponding ECONOMY temp ending at 12:00 pm. Then on the first period of the next day, set the COMFORT temp of the first period at 00:15 am with the corresponding ECONOMY temp ending at the desired time.

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.

Warmly Yours recommends running the floor heating system in F (Floor) mode for most homes. This provides the most efficient operation of the floor heating system and the best protection for the floor covering material that has been installed.

The T1033 can hold up to 7 programs.

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.)

Verify that the master thermostat is calling for heat. If it is and the light does not illuminate, this means that the test has failed. Cut power to the heating system at the main electrical panel, have a qualified electrician verify the installation and, if necessary, replace the CT230.

Two (2) wires; just the ground and the drive wires.

The Master Thermostat.

Three (3) wires; Ground, Drive, and 12 Volt DC.

The Master Thermostat must operate on 12 VDC and is powered by one of the linked CT230 units.

Up to ten (10) CT230 linked units can be used in a given system.

The wire distance between the master thermostat and each CT230 unit must not exceed 500 ft. (150 m). 20-AWG wires are recommended.

If your thermostat is blank, the first thing to do is to test to see if voltage is present at the rear of the thermostat. If no power is reaching the thermostat, please inspect the circuit breaker powering the thermostat in the breaker panel, and verify that the breaker is a non-GFCI type. If it is a GFCI breaker, replace it with a non-GFCI breaker. If there is power entering the thermostat and it is blank, it will need to be replaced.

Poor maintenance, overheating, insulation breakdown, and vermin damage are common causes.

If your floor is not heating and your thermostat is functioning properly, test to see if proper voltages are present at the transformer.  If 24 VAC is not being returned by the transformer, then it either needs to be replaced or checked to ensure that the internal secondary circuit breakers have not been tripped and are functioning properly.  Contact Warmly Yours technical support at 1-800-875-5285 for further assistance.

Class A for all new orders, Class B if replacing a Class B unit.

Warmly Yours controllers incorporate built-in Class A GFCI protection for all new floor heating systems.  Class A GFCI provides personnel protection and trips when ground fault current exceeds 5 mA (milliamps).  Class B GFCI protection is pretty much obsolete, but older systems may still require it.  Warmly Yours controllers with built-in Class B GFCI provide equipment and circuit protection and operates when a fault to ground exceeds 15 mA.

There is no factory reset of the thermostat. To effect a system reset, power it off and then back on at the circuit breaker.

Press and hold the DAY button for 3 seconds. All 7 days will then appear on the screen. Use the HOUR, MIN and PGM buttons to establish the desired schedule.

That is the sound the thermostat makes when the relay is either opened or closed to turn on or off the power to the floor heating elements. See this article for further information.

These are set with the configuration (dip) switches on the back of the faceplate. See the TH115 Owner's Guide for details or this article for more information.

Warmly Yours has developed this Quick Programming Guide to simplify operation. The full capabilities can be found in the Owner's Guide, or you can view this video for a great tutorial.

The manufacturer reversed the wiring pattern between the LOAD side and the LINE side on newly minted controllers, verify that your wiring matches the new wiring schematic stamped on the backplate of the new controller.

Most low voltage HVAC thermostats are OK to use with tile floors. If you are heating wood, vinyl, carpet, or any other flooring products that have a "maximum temperature" limit, then low voltage HVAC thermostats are not recommended UNLESS they have an input for a floor sensor. Check with the low voltage HVAC thermostat manufacturer about floor sensor inputs first, before buying a third-party integration kit for these types of flooring products.

22 Amps.

5 mA GFCI breakers, sized by a local electrician in compliance with local electrical codes.

If multiple Integration Kits are needed, we suggest using 240V Integration Kits and 240V heating elements. See our support area for the appropriate diagram. 

That depends on which thermostat you buy, how big a space that will be heated, and the voltage available and voltage of the heating elements.

WarmlyYours suggests contacting the manufacturer of the home automation system to determine compatibility or how it recommends operating an electric floor heating system.

If the smart thermostat cannot process a floor sensor reading, it is not compatible and the integration kit will not resolve this.

- Wake up the nJoy thermostat.

- Depress the outer lower right side multi-function button for 15 seconds.

- Arrow UP to select YEs

- Press the Select Circle to confirm.

The thermostat will then enter the Start-Up Wizard where default configuration settings are selected.

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

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

If your brightness is set to 10% and you have to constantly turn the thermostat back on, try changing the brightness to 20%. This is a HomeKit issue because HomeKit sets the inactive brightness to half of the active brightness, therefore if the brightness is set to 10%, half of it is 5%. The Mysa thermostat only has the ability to change the brightness in 10% increments, so a setting of 5% would turn off the thermostats. If you find yourself having any other brightness issues, try turning off the breaker and turning it back on again.

No. This film is just meant to protect the display from scratches during shipping and installation. To remove the film, gently lift up one of the corners and slowly peel the film off.

Yes. As the Mysa thermostat pulls current to power the heater, the unit itself warms up a little bit. The regular temperature of a Mysa thermostat housing normally varies between 35°C and 50°C (95°F and 122°F). So it's perfectly normal for the Mysa thermostat to be warm while it's controlling your heating system.

Yes, Mysa supports the majority of existing in-floor sensors. If you already have a sensor installed in your floor prior to the installation of the thermostat, please be sure to determine the resistance of your thermistor to ensure it's compatibility with the Mysa- this can be done using an ohmmeter which will display the resistance (eg. 10KΩ). If you want to install a sensor before the Mysa thermostat arrives, we recommend installing a standard 10KΩ sensor.

Please follow step-by-step guide here: nSpire Touch WiFi (UWG4-4999) WiFi Settings, Remote Control, and Voice-Control Integration Setup Guide

All thermostats are mandated at 42" height for handicap accessibility, most private residences are mounted at 52-60".

Please see this video on how to install a WarmlyYours nSpiration Series thermostat.

Menu > Installer Settings > Sensor Application > Select Floor > Press checkmark to save.

See video here: https://www.warmlyyours.com/en-US/video-media/switching-modes

nJoin unit is designed to work with nSpire series thermostats. If you would like to use third-party thermostat or controller, we recommend using our Integration kits that will receive “call for heat” and activate the floor heating.

12k ohms floor sensor only

No. The Honeywell CT230 must be controlled by a Honeywell Master Thermostat.

No. The nJoin power module is not compatible with a Honeywell system.

To reset the ground fault protection, switch the CT230 OFF and back ON, or cycle the circuit breaker off and on. The TEST light will turn off if the ground fault protection is functioning properly. If the TEST light comes back on, contact Warmly Yours at 1-800-875-5285 and speak to a technical support representative to help further troubleshoot your system.

Turn the power (circuit breaker typically) to the thermostat off for 5 minutes and then back on to reset the thermostat.

If there is power to the thermostat and it still doesn't appear to work, then the next step toward a solution is to take Ohm measurements of the floor heating system.

This is done with a digital multi-meter that can select a low 200 Ohm (Ω) scale. To conduct this test, turn off the circuit breaker. Remove the thermostat completely from the wall and disconnect the wires connected to the LOAD connections at the back of the thermostat. Disconnect the ground wires from the house ground, and do the test shown on the links below. If you are uncomfortable doing this test, contact a qualified electrician.

Please follow one of these guides based on the type of heating system installed:

TempZone Single Conductor

TempZone Twin Conductor

For a quick overview of the testing process:

Here is a video showing how the test is done

Here is a video showing how to locate and identify the floor heating wires

If the system still does not function, contact +1 (800) 875-5285 WarmlyYours Technical Support and provide the Ohm measurements for further assistance.

This could be due to one of the following:

a.) The higher temp reading might be due to a rubber bottomed / heavy rug, or piece of furniture placed over the floor sensor. This would trap heat over the sensor making it read a higher value than the rest of the floor –- Remove the item trapping the heat over the floor sensor.

b.) If the thermostat indicates a strange, higher measurement. Then more than one (1) floor sensor may have been hooked up to the thermostat -- Disconnect the extra sensor(s) and leave just one pair of wires hooked up (terminals C+D) to the thermostat.

c.) The floor sensor calibration may have been changed -- This setting should NEVER be changed, do a thermostat factory reset: Installer and User resets to clean this up.

d.) Is the OJ Microline thermostat used on a very old floor heating system? Some of the older systems, particularly the ones using an OJ Dual / Energystat thermostat had 12kΩ sensors in the floor -- Change the installer setting to read a 12kΩ floor sensor, instead of the default 10kΩ floor sensor.

If further assistance is needed, please contact WarmlyYours technical support.

After the OJ Microline UWG5 app has been installed on each user's device, utilize the same login credentials to operate the nJoy thermostat(s).

There is no need to set up secondary accounts to operate the nJoy thermostat.

Download the nJoy UWG5 app and ensure Bluetooth is enabled on your phone. Open the app, tap "Get Connected," and follow the on-screen instructions to complete the setup.

Note: The thermostat will not appear in your phone’s Bluetooth device list. Use the nJoy UWG5 app to complete the connection.

It is highly recommended to use a smartphone for the initial thermostat setup. Download the nJoy UWG5 app and ensure Bluetooth is enabled on your phone. Open the app, tap "Get Connected," and follow the on-screen instructions to complete the setup.

Note: The thermostat will not appear in your phone’s Bluetooth device list. Use the nJoy UWG5 app to complete the connection.

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.

To completely power off the thermostat, turn off the circuit breaker controlling the thermostat.

Alternatively, put the thermostat into Standby/Frost Protection mode by pressing the lower right button once. A Standby icon will show for a few seconds before it fades out. The thermostat is now in standby. To exit standby, press the lower right button for a moment.

- Select Settings.

- Select Zone to be deleted.

- Edit the selected zone (pencil icon just beneath the Zone list / icons).

- At bottom of page, select DELETE.

- Confirm Delete.

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'.

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.

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.

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

Error code "E2" means defective, damaged, or not connected floor sensor. Check connections or replace the sensor if necessary.

Sensor resistance should be in 8kΩ-15kΩ range and can be tested with a digital multimeter on a 20k scale. If the sensor resistance is out of range, it could be damaged. Please note, only one floor sensor can be connected to a single thermostat.

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

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

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

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

Otherwise, use Distributor ID 99887

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.

Yes the adaptive function is reset during a factory reset.

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.

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.

An OJ Microline UDG-4999 or ADG-4999. This thermostat can operate in REGULATOR mode.

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.

Please follow the interactive guide below:

By default, the Mysa thermostat will shows and control the floor temperature. However, you can choose to have the Mysa display and control the air (or ambient) temperature. The Mysa app will show air and floor temperature simultaneously.

Assure there is power to the timer. If there is power to the timer, then make sure the ON/OFF button is pushed all the way to the right - ON position. If this doesn't resolve the issue, press the RESET button using a paper clip. If none of these steps resolve the issue, then contact WarmlyYours at (800) 875-5285 to order a replacement controller.

Turn off at the circuit breaker.  Alternatively, the TH111 can be put in vacation mode by simultaneously pressing the sun and moon buttons.  To program the vacation temperature, select the desired degree and press on the sun and moon buttons simultaneously (aprx. 3 seconds) until the suitcase icon is displayed.

You can control your slab heating system with any WarmlyYours nSpiration Series thermostat. Depending on the size of your project, you may also need to add a relay or nJoin power module.

If the Mysa thermostat is unresponsive to touch and/or commands, there are a few things you can check:

• Make sure the protective plastic film has been removed from the thermostat, as this could interfere with the thermostat's ability to detect touch.
• If that didn't work, try a power cycle - turn the breaker connected to the thermostat off and then back on again.
• The last thing you can do is to make sure the ground wire is securely fastened to the ground screw in the gang box because this can sometimes cause the touch buttons to not function properly.