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Mysa Smart Thermostat How-to & Troubleshooting Guide

Mysa Smart Thermostat How-to & Troubleshooting Guide

Mysa is among the few companies that make smart thermostats for high voltage systems such as radiant ceilings, fan-forced convectors, and electric baseboards. You can control the thermostat using the Mysa app and other home automation apps to monitor indoor heat and humidity efficiently. The thermostat then communicates with the heating systems and adjusts according to your desired settings.

The Mysa thermostat hardly develops issues, but when it does, you may experience temperature issues, power glitches, unresponsive buttons, among others. Below we have discussed common technical problems with Mysa thermostats and provided possible solutions and troubleshooting tips.

How do I install a Mysa thermostat?

After ensuring that the Mysa thermostat is compatible with your heating system, follow the simple guide below on installing the thermostat without a technician. Mysa thermostats work with most 120-249V systems, including baseboards, in-floor, and air conditioners.

Things You’ll Need

  1. Mysa smart thermostat
  2. Two mounting screws
  3. Three-wire nuts
  4. Flathead screwdriver
  5. Phillips head screwdriver
  6. Wire stripper(optional)
  7. Pliers(optional)


  • To avoid electrocution, turn off power at the circuit breakers.
  • Remove the old thermostat.
  • Remove the faceplate of the thermostat.
  • Connect the Mysa thermostat to your 240V heating system and secure them using the wire nuts.
    • Connect Mysa’s white wire to the second place leg of the circuit, usually a red wire(L2).
    • Attach Mysa’s black wire to the black supply wire(L1) from the electrical panel.
    • Connect the Mysa’s red wire to the black load wire coming from the heater.
    • Attach Mysa’s green wire to the green or bare copper ground wire.
  • Connect the Mysa thermostat to the 120V heating system.
    • Attach Mysa’s white wire to the white neutral wire.
    • Connect Mysa’s black wire to the black supply wire from the electrical panel.
    • Attach Mysa’s red wire to the black load wire coming from the heater.
    • Connect Mysa’s green wire to the green ground wire.
  • Do not interchange the supply and load wires. If the display on the Mysa does not light up after installation, swap the supply and load wires.
  • Mount the thermostat to the wall and secure it with the mounting screws.
  • Attach the faceplate securely to the thermostat.
  • Turn on the circuit breaker, and you will see a smile symbol on the thermostat display.

How do I set the Mysa thermostat to pairing mode?

The Mysa thermostat gets into pairing mode for 15 minutes after resetting the device or after powering it for the first time or turning it off. When the device is ready to pair, a triangular pattern will appear on display. Here’s how to pair your thermostat to your WiFi router.

  • Go to Google Play Store or iOS App store and download the Mysa app.
  • Create a new Mysa account or log in to an existing account.
  • Click on the sidebar menu on the top-left corner and tap “Add thermostat.”
  • Go to “Get started” at the bottom of the screen.
  • Ensure your home’s router has a 2.4GHz network, then click “Next.”
  • Choose the thermostat you want to pair, usually with a purple button with the device ID.
  • The thermostat will pair with the WiFI network your smart device is using; therefore, make sure you’re using your home’s router. Then, click “Next” on the top right corner to proceed.
  • Label the thermostat, choose the type of heater it is controlling and tap “Done.”
  • Set a schedule to save on energy and money.
  • Follow the guide on the Mysa app to set up your device.
  • After successful pairing, a smile symbol will appear on the device.

How do I use the Mysa app?

The Mysa app allows you to control and configure your thermostat remotely from your smart device. After connecting your Mysa thermostat to the Wi-Fi router, you can use the app to create zones that allow you to automate control of all your electric heat. You can control up to fifty Mysa thermostats and at most ten homes from one Mysa app.

How do I program my Mysa thermostat?

Mysa is a smart thermostat that allows you to control and program your thermostat through the Mysa app remotely. The Mysa app has an easy guide that can help the user program all its features. Here is how you can program the smart features on your Mysa thermostat

Temperature control

The Mysa app allows you to remotely adjust your thermostat as long as there is an internet connection.

Press the up and down arrow buttons on the thermostat to increase and decrease the temperature, respectively.

Temperature schedule

This feature allows you to schedule and automates your indoor temperature. It means you can set a specific temperature for a particular time of the day. If you do not want to customize a schedule, press “quick schedule.”

To add a temperature change, go to schedule, press the “+” symbol on the upper right to select the days, times, and temperatures.

To remove a temperature change, you must manually tap and delete that specific schedule on each day set. You cannot apply a collective temperature change on the schedule.

Temperature zoning

If you own more than one Mysa thermostat, you can group them into zones and program the multiple heaters together. The Mysa thermostat allows you to adjust and customize the temperature in specific rooms instead of the whole house. It means you can heat a separate section of the house instead of heating the entire home.

Vacation scheduling

If you aren’t for a couple of days or weeks, you can remotely put your thermostat on Vacation Mode, which will immediately turn off your heat and override your schedule. The vacation mode helps you save on energy and money when you’re away for long periods without manually switching off the thermostat.


Your Mysa thermostat can turn your heater on or off when you enter or leave a defined distance around your home. In addition, the thermostat can ping your phone’s location and start the healing process when you get close to home or automatically shut off as you leave.

Energy tracking

Mysa thermostats can display easy-to-read charts that show the exact amount of energy you’re consuming to heat your home. You can use these charts to identify which rooms are consuming the most energy and at what time of the day. You can use this information to adjust the thermostat to reduce energy consumption and lower your power bill.

How do I reset my Mysa thermostat?

Here is how to reset your Mysa thermostat to factory default.

  • Press and hold both up and down arrows for 10-15 seconds.
  • Wait for the systems to reboot for about 30 seconds.
  • A smiley face will appear on the screen.
  • Press and hold the up and down arrows until FR appears on the screen.
  • You can now pair the unit again.


  • Disconnect the faceplate for about 10-15 minutes.
  • Return it.
  • The pairing icon will appear when it’s time for pairing.

How do I turn off MYSA?

When your Mysa is in off mode, it will be on, but it will not turn on your heaters. Before turning off your thermostat, disable geofencing to ensure your thermostat does not turn on automatically when the geofence is activated. You should also disable Mysa from all smart home automation such as Alexa, Homekit, SmartThings, IFTTT, and Google Home. There are two ways you can switch off your Mysa thermostat.

On the thermostat: Press and hold the down arrow button until three dots appear on the screen. Release the down arrow button, and the thermostat will go off.

In the Mysa App: Click on the tile of the thermostat you want to switch off. Next, press the flame icon on the right corner, and a pop-up screen will appear. Next, click on the “Off” button with a plug icon.

How do I take Mysa out of pairing mode?

The Mysa thermostat is usually on pairing mode only for 15 minutes after a reset or power up the device. So if you want to take the device out of pairing mode, you have to wait 15 minutes, and the device will automatically leave pairing mode.

Does Mysa work without Wi-Fi?

Yes, your Mysa thermostat can function without an internet connection. However, the only function you can program is temperature control using the up and down buttons on the thermostat display. You cannot pair your device or access all the other smart features that Mysa provides.

How do I remove the Mysa thermostat?

To delete your Mysa thermostat to stop it from controlling your heater, follow the steps below.

  • In the Mysa app, choose the thermostat you would like to remove.
  • Click on the gear icon in the top right corner of the screen.
  • Tap the trashcan icon in the top right corner.
  • Press “Confirm” to remove the thermostat.
  • If your Mysa was using any Home Automation app, delete it from all the Home Apps.

How do I update Mysa?

As long as the Mysa thermostat is connecting to WiFi, your device will always update automatically. During an update, you will see a circling rectangle on the device for a couple of minutes. If you want to check your thermostat’s firmware version, open the Mysa app, and click on the thermostat you want to check on. Next, press the gear icon in the top right corner and go to the bottom of the page, where you will see the Firmware Version number.

Does Mysa work with wall heaters?

The Mysa thermostats are only compatible with a variety of high-voltage wall heaters such as electric baseboard heaters, electric fan-forced heaters, self-contained hydronic baseboard heaters, and in-ceiling radiant heaters. Mysa can control high voltage electric heating systems with a maximum of 3800 watts at 240 volts or 1900 watts at 120 volts. Unfortunately, Mysa does not work with central-forced furnace systems such as electric furnaces, gas furnaces, heat pumps, and boilers because they are low-voltage systems.

Mysa thermostat turning on and off

If the Mysa thermostat causes the heating system to turn on and off, the device is short-cycling. Short-cycling happens when the electrical connections inside the thermostat do not have consistent contact. Below are some possible reasons why your thermostat keeps turning on and off.

  • It is typical for the Mysa thermostat to turn the heaters on and off to stabilize the room temperature. Therefore, when you set your desired temperature, Mysa will stay at that temperature as it constantly controls the heaters. You can also adjust this frequency in the heater settings on your app.
  • Open the thermostat’s faceplate and look for loose wiring and terminal connections. Sometimes power surges can loosen wire connections. Tighten the wire connections to ensure they are passing current consistently.
  • Check if you have a compatible system. If you connect your Mysa to an incompatible heating system, then you’re likely to experience power instability. Mysa thermostats work with most voltage heating systems but not all of them. Therefore, check if your heating system is compatible with Mysa before a purchase.
  • If your Mysa is not responding to commands, check the ground wire and ensure it is fastened securely to the ground screw in the gang box.

How to change Mysa thermostat Wi-Fi

Here’s how you can change the Mysa thermostat WiFi settings.

  • Connect your smart device to the same network you want to pair with your Mysa.
  • Check if there is a downward triangle on the thermostat’s display.
  • If the thermostat you’re trying to change is on the Mysa app, delete the thermostat.
  • Delete the thermostat from any Home Automation app it is on.
  • Factory reset your thermostat. Press the up and down arrow buttons simultaneously for 10-15 seconds. A smiley face will appear on the display when the device has reset.
  • Turn off power to the Mysa at the circuit breaker, then turn it back on.
  • Open the Mysa app and then pair your thermostat to the new WiFi.
  • If you have more than one Mysa, you have to repeat the process with all the devices.

Mysa thermostat room temperature seems off.

If your Mysa thermostat is acting differently, it is not working, not displaying anything, or not communicating with your heaters, we have a list to check for that will help you identify the problem and fix it.

Check the thermostat has electrical power.

If the display screen on your Mysa thermostat is blank, you should check if the device is receiving power. Check if the circuit breaker has tripped or the fuse has blown. Reset the tripped breaker or replace the burnt fuse.

Check for loose connections and damaged wires.

Remove the thermostat’s faceplate, check if there are any loose or disconnected wires, and reconnect them properly. Tighten all terminals with loose screws and ensure the wires are well connected. If you notice any torn or corroded wires, replace them.

Check for dirt and dust.

Electrical wires clogged with dirt can cause the thermostat to start failing. Switch off power at the circuit breaker and remove the thermostat faceplate. Use a soft article brush or canned air to remove dirt and grime that may be affecting its functionality. Pay more attention to switch contact surfaces and bimetallic coil. Return the faceplate, reconnect power, reset the thermostat to your desired temperature.

Poor thermostat location

Thermostats work by detecting the room temperature, compares it to the temperature setting, and adjusts the heaters accordingly. For the thermostat to measure the room temperature correctly, it has to be in a place with a neutral temperature. For instance, the thermostat in your kitchen should not be around your cooker. So if your Mysa seems not to control the heating system correctly, you should consider its location in the room.

Reset the thermostat

If the thermostat is unresponsive to touch or commands, you can try power cycling or resetting the device. Switch off the thermostat at the circuit breaker for about 5-10 minutes and then turn it back on.

Modify the temperature

If the heater fails to set the temperature on the thermostat, try setting the thermostat five degrees warmer during the summer and five degrees colder during the winter.

Check this too: Ecobee Thermostat How to & Troubleshooting Guide

Mysa thermostat error codes and their meaning

When there is an issue with the heating system, an error code will appear on the thermostat’s display screen. Here are some of the error codes, their meanings, and how to fix them.

H2 error: This error means The thermostat is not detecting the heating load. Check the connection between the Mysa load and the heating system load and ensure it is not loose. Also, ensure the correct cable is connecting to the Mysa from the heating system. If the connection is loose, retighten and if the wiring is wrong, disconnect all the wires and reconnect them properly.

H3: This error means the GFCI has tripped. Try resetting the device by pressing the GFCI reset button on the right side of the Mysa thermostat.

I3: This error indicates a loose connection or a disconnect between the sensor wire to your Mysa. Check the wiring and ensure the connection is secure.

If the thermostat displays any other code, always contact the Mysa support team to send a technician.


Overall, Mysa Smart thermostats require little to no maintenance to work efficiently other than the periodic electrical servicing. You can fix most issues by making sure the wiring connections are secure and free from dirt. Resetting the thermostat will also help with firmware glitches and clearing error codes.