🌡️Thermostat

SMOKE-DETECT

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 SMOKE-DETECT Error Fix: Smoke Alarm Sound Detected

The thermostat microphone detected a sound pattern matching a smoke alarm — check the home immediately for fire or smoke, verify all smoke and CO detectors, and check for false triggers from cooking smoke or low-battery chirps from nearby smoke detectors

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error SMOKE-DETECT on the Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included means: Smoke Alarm Sound Detected. The top-ranked community fix is “Inspect and Replace Thermostat Microphone or Firmware Update” (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-$200.

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

AIR-QUALITY

Air Quality Alert

2 fixes

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

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

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

Error code SMOKE-DETECT on the Ecobee ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included means: Smoke Alarm Sound Detected. The thermostat microphone detected a sound pattern matching a smoke alarm — check the home immediately for fire or smoke, verify all smoke and CO detectors, and check for false triggers from cooking smoke or low-battery chirps from nearby smoke detectors

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

The most successful fix is "Inspect and Replace Thermostat Microphone or Firmware Update" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code SMOKE-DETECT 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 SMOKE-DETECT myself?

Yes — the top-ranked community fix ("Inspect and Replace Thermostat Microphone or Firmware Update") is rated medium difficulty and takes about 45 minutes. Tools needed: T10 Torx screwdriver, Voltage tester, Multimeter.

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 SMOKE-DETECT?

DIY cost: $15-$25. Professional repair typically costs $120-$200. 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: AIR-QUALITY (Air Quality Alert), 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), 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:

AIR-QUALITY — Air Quality Alert (2 fixes)
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)

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