If your Mysa smart thermostat is showing the wrong temperature, not heating properly, or seems miscalibrated, this guide covers the most common causes and fixes from the community.
Allow Time for Self-Calibration
After installation or after a reboot, Mysa needs time to calibrate:
- The self-calibration process typically takes about one hour
- During this time, temperature readings may be inaccurate
- Don't make judgments about accuracy until calibration is complete
After rebooting or installing, release the button and wait for the device to power back on. Mysa will self-calibrate to the ambient temperature.
Check Thermostat Placement
Where your Mysa is mounted significantly affects temperature accuracy:
Common placement issues:
- Too close to heater: Mounting the Mysa too close to the baseboard heater can cause it to read higher temperatures due to proximity to the heat source rather than actual room temperature
- External airflow: Avoid placing external sensors directly above Mysa, as this can result in inaccurate readings from vented air
- Direct sunlight: Sunlight hitting the thermostat can cause artificially high readings
- Drafty locations: Cold drafts near windows or doors can cause artificially low readings
Ideal placement:
- On an interior wall
- Away from heat sources and vents
- At chest height (about 4-5 feet from the floor)
- Out of direct sunlight
Room Factors Affecting Temperature
Your room's characteristics affect how Mysa reads and maintains temperature:
- Room size: Large rooms may have temperature variations between where the thermostat is and where you feel the temperature
- Insulation: Poor insulation can cause rapid heat loss, making it seem like the thermostat isn't working properly
- Construction: Concrete floors or high ceilings affect how heat distributes in the room
Reboot Your Mysa
A simple reboot can fix many issues:
For baseboard heater or in-floor Mysa:
- Press and hold the down arrow on your Mysa device
- Keep holding until the device powers down
- "RT" should display on the screen
- Release the button
- Wait for the device to restart
- Allow one hour for recalibration
Factory Reset
If a reboot doesn't help, try a full reset:
- Press and hold both the up and down arrows simultaneously
- Keep holding until the reset process begins
- This will reset the thermostat to its default settings
- You'll need to set up the thermostat again in the Mysa app
Check WiFi Connection
Connection issues can cause the thermostat to behave unexpectedly:
- Open the Mysa app and check the device status
- If showing as offline, the thermostat may not be receiving schedule commands
- Verify your WiFi is on 2.4GHz (Mysa doesn't support 5GHz)
- Try moving your router closer or adding a WiFi extender
Verify Heating System Compatibility
Make sure your Mysa model matches your heating system:
- Mysa for Electric Baseboard: Works with 120V/240V line voltage electric baseboard heaters
- Mysa for In-Floor Heating: Designed specifically for electric in-floor radiant heating
- Mysa V2: Compatible with high-voltage electric heating systems
Using the wrong model for your heating system can cause improper operation.
Check Wiring
Incorrect wiring can cause heating issues:
- Verify the line (power in) and load (heater) wires are connected correctly
- Make sure connections are tight and secure
- If you're not comfortable with electrical work, consult an electrician
Third-Party Integration Issues
If using Mysa with SmartThings, HomeKit, or other platforms:
Some users in the SmartThings Community have reported connection issues: "The first time I tried to add the Mysa thermostat, the connection succeeded. However, after a few days there were problems."
If the thermostat doesn't appear in your smart home app:
- Make sure the Mysa is working in the native Mysa app first
- Try unlinking and relinking your Mysa account
- Check for app updates on both sides
Temperature Offset
If the displayed temperature is consistently off by a fixed amount:
- Use a separate thermometer to verify the actual room temperature
- Note the difference between Mysa's reading and the actual temperature
- Contact Mysa support—some models allow temperature offset adjustments
Contact Mysa Support
If these steps don't resolve the issue:
- Mysa has a dedicated all-human Customer Experience team
- They can help diagnose hardware issues or provide firmware updates
- Visit help.getmysa.com for support options
Community Discussions
- Incorrect Displayed Temperature – Mysa Support
- General questions & troubleshooting – Mysa Support
- Unresponsive or blank Mysa Thermostat – Mysa Support
- Problem adding my Mysa thermostat – SmartThings Community
- Support for Mysa thermostat – Home Assistant Community