Call for Service

If your thermostat is displaying “Call for Service” without E5, then your heating/cooling system is likely not responding as it should.

• Heating Issue
• Cooling Issue
• Can’t switch system modes/buttons don’t work
• Inaccurate temperature or humidity reading
• Wire in the L terminal
• E5-Specific Call for Service

Heating Issue

If the thermostat displays “heating,” but the room temperature is dropping instead of warming up, your thermostat may display “Call for Service.”

Check out our heating troubleshooting articles here:

• Why isn’t my heating turning on?
• Loss of heating alert – Furnace is on, but air may not be hot.

Cooling Issue

If the thermostat displays “cooling,” but the room temperature is rising instead of cooling off, your thermostat may display “Call for Service.”

Check out our cooling troubleshooting articles here:

• Why isn’t my cooling turning on?
• Loss of cooling alert – Compressor is on, but air may not be cool.

Can’t switch system modes

If you’re unable to switch to Cool Mode or Heat Mode, make sure the configurations on your thermostat are correct by checking the instructions. If you’re still unable to adjust the buttons or your set temperature keeps switching to 99F, contact Sensi support.

Inaccurate temperature or humidity reading

If your Sensi has a temperature or humidity reading that is only a few degrees different than the real home temperature/humidity, use our Offset features to adjust it. You can also reset your thermostat to recalibrate the temperature/humidity. Learn how to reset your Sensi model.

• Temperature Offset
• Humidity Offset

If the temperature reading is 99F+ or there are only dashes for the room temperature (“--“), or the humidity percentage reads 255%, then likely there is a problem with the internal sensor. Contact Sensi support to get a replacement.

Wire in the “L” Terminal

If you have a wire in the “L” terminal, try removing it, pushing it back into the wall, and then reinstalling the Sensi thermostat to see if the “Call for Service” message goes away. If there is voltage on the “L” wire (diagnostic terminal), it will display “Call for Service.” If this resolves the issue, you may want to contact a service professional as to why there is voltage present on your diagnostic wire, but if your system is operating as expected, it is a personal preference. The “L” wire is not needed for normal operation.

E5-Specific Call for Service

If your thermostat displays “Call for Service” and “E5,” refer to our “E5” specific article.