ecobee thermostat: Aux Heat Runtime Alert
The auxiliary heat source has run for more than the set amount of time in 24 hours (3 hours by default).
Applies to: ecobee thermostats controlling auxiliary heat. What you see: words.
What to do
ecobee Support gives no step for this on the page cited; the meaning above is all it says.
Source
ecobee’s own help page, read on the date shown.
- ecobee Support: How to set Reminders & Alerts on your ecobee thermostat — ecobee smart thermostats, including Smart Thermostat Lite and Essential. support.ecobee.com Checked 2026-09-29.