Ecobee Thermostat Error Code 15: How to Fix It

Easy 10-15 minutes Medium Severity Verified June 2026
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Error Code
15
Brand
Ecobee
Product Type
thermostat
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
10-15 minutes
Error code 15 on your Ecobee thermostat means the firmware update failed to install. This usually happens due to a weak WiFi connection or a temporary glitch. Don't worry—it's easy to fix with a few simple steps.
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How to Fix Error Code 15

  1. Restart Your Ecobee Thermostat

  2. Check Your WiFi Connection

  3. Force a New Firmware Check

  4. Reinitialize the Firmware Update

  5. Reset Network Settings

  6. Contact Ecobee Support

    Do not factory reset unless instructed by support, as it erases all settings.
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When to Call a Professional

If you've tried all steps and still see error 15, the issue may be with your router or Ecobee's servers. Contact Ecobee Support or a local HVAC technician if your thermostat remains unresponsive.

Frequently Asked Questions

What does Ecobee error code 15 mean?
Error code 15 indicates that a firmware update failed to install. This is typically caused by a weak WiFi signal or a temporary software glitch.
How do I restart my Ecobee thermostat?
Remove the thermostat from its wall plate, wait 30 seconds, and then reattach it. This will restart the device and clear minor errors.
Can I update my Ecobee thermostat manually?
Yes. Go to Main Menu > Settings > About > Check for Updates. If an update is available, it will install automatically.
Will error 15 damage my thermostat?
No. Error 15 is a temporary update failure and will not damage your thermostat. It just means the new software didn't install.
Does Ecobee error 15 require a factory reset?
Usually not. A restart and network reset often fix the issue. Factory reset is a last resort and should only be done with support guidance.

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