Ecobee ecobee SmartThermostat with Voice Control and Alexa Built-In HIGH-HUMIDITY Error Fix: High Humidity Alert

Error code HIGH-HUMIDITY on the Ecobee ecobee SmartThermostat with Voice Control and Alexa Built-In means: High Humidity Alert. Indoor relative humidity exceeded the configured high humidity threshold — excess humidity can cause mold growth and discomfort; check that the dehumidifier or AC is running, and verify the thermostat humidity settings and overcool feature configuration

The most successful fix is "Inspect and Service HVAC Drainage and Sensors" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

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

Yes — the top-ranked community fix ("Inspect and Service HVAC Drainage and Sensors") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Soft cloth, Isopropyl alcohol, Wet/dry vacuum.

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Ecobee ecobee SmartThermostat with Voice Control and Alexa Built-In 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.

Error code HIGH-HUMIDITY also appears on 5 other Ecobee models: ecobee Smart Thermostat Enhanced with Radar Occupancy Sensor and Large Touchscreen, ecobee Smart Thermostat Essential with Touchscreen Display and eco+ Smart Features, ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included, ecobee3 Lite Smart Thermostat, ecobee4 Smart Thermostat. The fix may vary by model, so check each model's specific page for tailored repair steps.