🌡️Thermostat

AIR-QUALITY

Ecobee · ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included

Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included AIR-QUALITY Error Fix: Air Quality Alert

The built-in air quality monitor has detected a significant drop in indoor air quality based on volatile organic compounds (VOCs) and CO2 levels — open windows for ventilation, check for sources of indoor air pollution, and run the HVAC fan to circulate and filter air

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error AIR-QUALITY on the Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included means: Air Quality Alert. The top-ranked community fix is “Replace HVAC Air Filter and Calibrate Ecobee Air Quality Sensor” (medium difficulty, ~45 min, DIY cost: $15-$25). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · thermostat

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many thermostat repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $120-$180.

Other Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included Error Codes

APP-SYNC

App and Thermostat Out of Sync

2 fixes

AUX-OUTDOOR

Auxiliary Heat Outdoor Temperature Alert

2 fixes

AUX-RUNTIME

Auxiliary Heat Runtime Alert

2 fixes

BLOWN-FUSE

HVAC Control Board Fuse Blown

2 fixes

COOL-FAIL

Cool Not Reaching Set Temperature

2 fixes

FAN-CONSTANT

Fan Running Constantly

2 fixes

FILTER-REMIND

Furnace Filter Reminder

2 fixes

HEAT-FAIL

Heat Not Reaching Set Temperature

2 fixes

People Also Ask About Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included Error AIR-QUALITY

What does error code AIR-QUALITY mean on a Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included?

Error code AIR-QUALITY on the Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included means: Air Quality Alert. The built-in air quality monitor has detected a significant drop in indoor air quality based on volatile organic compounds (VOCs) and CO2 levels — open windows for ventilation, check for sources of indoor air pollution, and run the HVAC fan to circulate and filter air

How do I fix error code AIR-QUALITY on my Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included?

The most successful fix is "Replace HVAC Air Filter and Calibrate Ecobee Air Quality Sensor" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code AIR-QUALITY on a Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included error AIR-QUALITY myself?

Yes — the top-ranked community fix ("Replace HVAC Air Filter and Calibrate Ecobee Air Quality Sensor") is rated medium difficulty and takes about 45 minutes. Tools needed: Flathead screwdriver, Smartphone or thermostat interface.

How much does it cost to repair Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included error AIR-QUALITY?

DIY cost: $15-$25. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included have?

The Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included has 8 other known error codes, including: APP-SYNC (App and Thermostat Out of Sync), AUX-OUTDOOR (Auxiliary Heat Outdoor Temperature Alert), AUX-RUNTIME (Auxiliary Heat Runtime Alert), BLOWN-FUSE (HVAC Control Board Fuse Blown), COOL-FAIL (Cool Not Reaching Set Temperature), and 3 more.

What other error codes does the Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included have?

The Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included has 8 other known error codes:

APP-SYNC — App and Thermostat Out of Sync (2 fixes)
AUX-OUTDOOR — Auxiliary Heat Outdoor Temperature Alert (2 fixes)
AUX-RUNTIME — Auxiliary Heat Runtime Alert (2 fixes)
BLOWN-FUSE — HVAC Control Board Fuse Blown (2 fixes)
COOL-FAIL — Cool Not Reaching Set Temperature (2 fixes)
FAN-CONSTANT — Fan Running Constantly (2 fixes)
FILTER-REMIND — Furnace Filter Reminder (2 fixes)
HEAT-FAIL — Heat Not Reaching Set Temperature (2 fixes)

Ad Space — banner

Replace ADSENSE_PUBLISHER_ID in AdUnit.tsx