Mysa WiFi Programmable Thermostat

Mysa WiFi Programmable Thermostat
Part Number: MYSA-TH-WIFIPast Model
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Support Questions

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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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

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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.

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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 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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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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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.
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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.

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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.

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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.

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

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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.

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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.

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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.

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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.

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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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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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Specifications

Controls

App Languages English, French
Display LED display with capacitive touch buttons

Warranty / Certifications

Approvals cTUVus listed to UL and CSA standards
Warranty Limited 3-year warranty and lifetime technical support

Electrical

Connection 4 wires, double pole
Connection Method Hardwired
Ground Fault Protection (GFCI) Class A, 5 mA
Maximum Current 16 A
Maximum Load (Resistive Only) 1,900 W - 120V, 16A 3,800 W - 240V, 16A

Thermostat

Floor Sensor Compatibility 5k - 20k ohms
Included Floor Sensor Yes (1)

Product Dimensions

Height 5.12″
Installed Depth 0.75″
Weight 1.2 lbs
Width 3.54″

Identifiers

SKU MYSA-TH-WIFI
UPC (GTIN-12) 821661208273

Connectivity

WiFi 802.11 g/b/n @2.4GHz, Supports WPA2

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