Troubleshooting Auto Mode: Why Isn’t My System Heating or Cooling?Updated 24 minutes ago
If you're using Auto Mode on your Mysa thermostat and notice that heating or cooling isn’t turning on as expected, this guide will walk you through common reasons and how to check each one.
1. Check That Auto Mode Is Fully Enabled
Auto Mode must be:
Enabled in the app
Paired to your system
Running firmware version 4.4.11 or higher
✅ To verify:
Open the Mysa app
Tap your device tile
Ensure Auto is selected in the Mode menu
Go to Settings > Thermostat Preferences and confirm that Auto Mode and a deadband have been set
❗ If Auto Mode is not visible on the thermostat hardware
2. Confirm Your Heat To and Cool To Setpoints
In Auto Mode, the system only activates:
Heating if room temp is below the Heat To setpoint
Cooling if room temp is above the Cool To setpoint
Neither if the room temp is between the two (this is the deadband range)
✅ To check:
Look at the current room temperature
Compare it with the Heat To and Cool To setpoints in the app
If the current temperature is within the setpoint range + deadband, your system will not engage heating or cooling (this is normal)
💡 Tip: If you're unsure, try manually adjusting the setpoints further apart to test system behavior. Example: Set Heat To = 70°F and Cool To = 75°F.
3. Review Your Deadband Settings
The deadband is the minimum gap between Heat To and Cool To.
Default: 4°F (2°C)
Customizable: Up to 10°F (6°C)
Too-small of a gap won’t be accepted, and a larger gap may make it feel like nothing is happening.
✅ To check:
In the app, go to Device Settings > Thermostat Preferences
Confirm the deadband value
Make sure the setpoints follow:
Cool To ≥ Heat To + Deadband
🛠 If your Heat To is 68°F and the deadband is 4°F, your Cool To must be at least 72°F.
4. Consider Built-In System Delays
Auto Mode still follows system protection rules like:
Minimum Compressor Off Time (e.g., 5-minute delay between cooling cycles)
Cycles Per Hour (CPH) limits (e.g., 3 cycles/hour for heat pumps)
Temperature Differential (swing)
These protections can make the system wait, even if heating or cooling is needed.
✅ To test:
Wait at least 5–10 minutes after changing setpoints
Try manually increasing or decreasing the room temperature significantly
Watch for the heat or cool icon in the app or on the thermostat display
🔁 For immediate testing, temporarily set Heat To well above or Cool To well below the current room temperature.
5. Verify Fan Behavior
If the fan is running but the system is not heating or cooling:
The room temperature may be within the deadband
Or the system is in a delay (MCOT or CPH)
✅ Fan-only behavior is normal in Auto Mode
You can check fan settings under:
Settings > Thermostat Preferences > Fan Control
Still Having Issues?
If you’ve verified all the above and the system still isn’t behaving as expected:
Restart the Mysa app
Power cycle your HVAC system (if safe to do so)
Confirm your firmware version is 4.4.11 or higher
For further help, contact Mysa Support with:
A description of the issue
A screenshot of your setpoints and room temperature
Your firmware version (found in Device Settings > About)