Nest Thermostat Fan Running Continuously After Update
- Firmware update bug affecting fan control
- Fan schedule setting corrupted
- Wiring compatibility issue
Problem Description
Your Nest thermostat fan runs continuously after a firmware update was installed, even when heating and cooling are not active and no manual fan schedule is set. Post-update fan running is almost always caused by a firmware change that reset the fan mode to On instead of Auto, or changed the circulation fan timer to a continuous setting that persists after the update.
Symptoms
- HVAC fan never stops running
- Fan runs when set to auto mode
- Continuous fan operation after update
- Fan schedule settings ignored
- Energy usage increased significantly
- System runs constantly but maintains temperature
Recognize these? Here's what usually causes it.
Common Causes
- Firmware update bug affecting fan control
- Fan schedule setting corrupted
- Wiring compatibility issue
- Temperature sensor calibration off
- Fan circulate setting enabled incorrectly
- HVAC system integration problem
Most fixes happen in the first 3 steps.
Do not manually override HVAC equipment to stop fan as this can damage system. Always use thermostat controls or contact HVAC technician.
Tools & Requirements
These tools will help you complete this fix.
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Step-by-Step Solution
Reset Fan Schedule to Auto
Open Nest app go to thermostat Settings > Fan and ensure fan schedule is set to Auto. Turn off any fan circulate options that may have been enabled by the update. Save settings and monitor for 30 minutes.
Restart Nest Thermostat Completely
Press and hold thermostat ring for 10 seconds until screen goes blank then release. Wait 2 minutes for complete restart. This clears any firmware glitches from the update that may cause continuous fan operation.
Check Fan Circulate Settings
In Nest app look for Fan Schedule or Equipment settings. Disable any fan runtime percentage or circulate options. Some updates enable these features by default which causes continuous fan operation.
Recalibrate Temperature Sensors
Go to Nest app Settings > Equipment > Continue > Recalibrate. This resets temperature sensing which may be causing thermostat to run fan continuously thinking temperature adjustment needed.
Contact Nest Support for Firmware Issue
If fan continues running constantly after trying other steps contact Google Nest support. Report the firmware version and continuous fan issue as this may be a known bug requiring firmware rollback or patch.
Quick Solutions
Still having issues? This is usually the deeper cause below.
Schedules that skip randomly are usually a daylight-saving holdover — delete and recreate the schedule to clear the corrupted entry.
Document your normal fan operation patterns before firmware updates to easily identify when behavior changes after updates. **Product Intelligence:** - C-wire required for most models - 2.4GHz WiFi only - Nest Aware subscription for history
Thermostat issues that keep returning are often caused by stale backup-battery memory holding old settings across power cycles without the user realising.
- Firmware update bug affecting fan control
- Fan schedule setting corrupted
- Wiring compatibility issue
- Temperature sensor calibration off
- Fan circulate setting enabled incorrectly
Before you go — try one of these (they fix most cases).
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Official Manufacturer Manual
Google Nest provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Google Nest Thermostat.
Source: google.com
Need More Help? Google Nest Support
Note: The contact information below connects you directly to Google Nest's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
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