Baseboard: Won't Power On / No Display

Last updated: July 19, 2026

If your Mysa for Baseboards has no display, or won't power on after installation, work through these steps. For wiring reference while you troubleshoot, see the Baseboard Wiring Guide.

No Voltage Tester?

Before turning off the breaker, turn your existing thermostat all the way up and confirm heat is coming from your heater. Then turn off the breaker and wait — if the heater cools down, power is off. If you're completely unsure which breaker controls your heater, you can turn off all power at your main panel. Do this during daylight hours.

Thermostat Won't Power On

  1. Remove the faceplate and look for a green LED on the base plate.

  2. If no green LED: the L1 supply wire (usually black, from breaker) isn't connected to Mysa L1. Turn off power and check the connection.

  3. If green LED is lit: Mysa is receiving power. Remove the faceplate for 3–5 minutes, then reattach it. If the display still doesn't light up, contact support.

Reboot Methods

  • Soft reboot: hold the up and down arrows (or buttons) for 10 seconds

  • Hard reboot: turn off the circuit breaker, wait 30 seconds, then turn it back on

Still Not Working?

Take a photo of your wiring and send it to install@getmysa.com — our team can help identify the issue.

Installation Video

Watch the installation video — filmed with Mysa for Baseboards – V2, but the steps are the same for Lite.

Related

  • Heating issue instead of a power issue? See Baseboard: Heat Won't Shut Off / No Heat

  • Seeing a specific error code? See Baseboard Error Code Reference

Get Support

Email: install@getmysa.com