nJoy WiFi LED Touch Programmable Thermostat (UWG5-4999-WY)

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.

1. Go into the nJoy App.
2. Connect with Bluetooth.
3. For the desired thermostat, select the blue settings wheel in the upper right corner.
4. Select 'Manage Thermostat'.
5. Navigate down to 'Wi-Fi Settings'.
6. Select the blue bar at the bottom of the screen 'Change Wi-Fi Settings'.
7. Identify your WiFi network and 'Connect Manually'.
8. Enter that WiFi network's credentials (userid & password).

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.

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

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.

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.

- 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.

- 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.

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.

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.

Check these common causes:

• Trapped heat: a heavy or rubber-backed rug or furniture over the sensor makes it read high. Move the item.
• Two sensors connected: disconnect the extra sensor and leave one pair of wires on terminals C+D.
• Changed calibration: this setting should never be changed. Do a factory reset (Installer and User resets).
• Older system: some older systems, especially those with an OJ Dual/Energystat thermostat, used 12kΩ sensors. Change the installer setting from the default 10kΩ to 12kΩ.

Need more help? Contact WarmlyYours technical support.

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.

WarmlyYours 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.  WarmlyYours controllers with built-in Class B GFCI provide equipment and circuit protection and operates when a fault to ground exceeds 15 mA.

For systems below 12 Amps, a 15 Amp, Non-GFI breaker is fine. For systems 12 to 16 Amps, a 20 Amp, non-GFI breaker is needed. Breaker sizes are noted on the installation plan that ships with many orders.

For nTrust 2.0 (UTN5) and nJoy (UWG5), power and signal terminals have different wire limits:

• Power terminals (1–4): 14–12 AWG solid or stranded wire; 14–13 AWG stranded wire with ferrules. Recommended strip length: 10 mm.
• Signal terminals (A–D): 22–18 AWG solid or stranded wire; 22–20 AWG stranded wire with ferrules. Recommended strip length: 6 mm.

These are terminal capacities, not circuit-sizing instructions. Have a qualified electrician select wiring for the circuit and applicable electrical code.

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.

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.

The nJoy App software update is made available by OJ Microline and is controlled by the device's Google Play or Apple App stores.

Some people prefer to let the system handle the nJoy App update process automatically. Others prefer to disable automatic nJoy App update and do it themselves. If there is an update available in the App Store/Google Play, an update can be invoked from there buy the user.  If there is no update available, then the nJoy App is current (up-to-date).

Apple   SEP2025 Info: https://support.apple.com/en-us/102629

Google SEP2025 Info: https://support.google.com/googleplay/answer/113412?hl=en

There are a couple of methods to ensure your thermostat schedule is off.

1.) Physically at the thermostat; press the temperature area of the screen for 3 seconds. It will scroll a message confirming this action and you will no longer see the schedule on the screen of the LED thermostat.

2.) Remotely on the nJoy app; note that this only works when connected via WiFi (not bluetooth), there is a schedule icon in the blue tile representing your thermostat. Select your thermostat and on the next screen below the temperature is ACTIVATE + STANDBY, select ACTIVE to change this. Then either slide the window down or go to Schedules after deactivating, in order to exit that screen. Note that this option does not show in 'Schedules' and that a default schedule must always exist (even if turned off).