My Mysa is not powering on. What do I do?

This article will also apply to the following inquiries: The display isn't on, my thermostat stopped working, the faceplate isn't working, and Mysa will not turn on. 

Warning: Any work with high voltage equipment can be dangerous or even fatal. It should be performed by a qualified electrician. Please ensure that you comply with local electrical codes and regulations. Improper installation can lead to device failure and even cause a fire. Damage to thermostat due to improper installation is not covered under warranty.

Solution One

If you followed our step by step installation guide and the mysa display does not light up upon turning on the power, run through the following steps:

1. Turn off the breaker

Line voltage thermostats such as Mysa are connected to dangerous voltages. Make sure you turn off the circuit breaker for the thermostat you are troubleshooting.

2. Switch the wires

Because the L1 and the Load wire are typically black, it is often difficult to tell which one is which in your gang box. To test whether your Mysa is wired up incorrectly, switch the red and black wires coming out of the Mysa thermostat around.


After switching the wires, turn the power back on and see if the display lights up. If it doesn't, please try Solution Two.

Note: Mysa does not work with 3-phase wiring instances. While not common in residential homes, some homes have three-phase electric power and therefore are incompatible.

Solution Two

It’s possible that one of the pins that connect Mysa’s faceplate to the backplate became misaligned during installation. Please remove the faceplate and ensure that these 10 pins are aligned before putting on the faceplate again. If you find that there is an angled pin, carefully adjust it and then remount the faceplate.



If the issue persists after you have tried both solutions, please contact our support team, here

Can’t find your answer in our support center? Contact us directly.