How Do I Set Up Fan Circulate on My Sensi Thermostat?
- G (fan) wire missing or not landed in the G terminal
- Circulate not enabled or set to zero minutes per hour
- Fan set to On (continuous) instead of Circulate
Problem Description
You want your Emerson Sensi to circulate air with the fan, running the blower periodically even when there is no call for heating or cooling, but the Circulate feature is not working or you are not sure how to set it. Circulate runs the fan for a set number of minutes each hour to even out temperatures, and it needs a G (fan) wire and the right app setting to work.
Why This Happens in Real Homes
Sensi's Circulate feature runs the blower for a set number of minutes each hour to keep air moving and temperatures even when the system is not actively heating or cooling, and like all fan functions it depends on the G wire landed in the G terminal. If G is missing, or was repurposed as the common wire during a no-C-wire install, Circulate cannot run the blower on its own. Once the wiring is right, Circulate is a setting, not automatic: you choose how many minutes per hour the fan runs, and setting it too low (or to zero) makes it seem like nothing happens, while setting the fan to On instead runs it continuously rather than periodically. If G is landed, the system type is correct in the wire picker, and Circulate is set to a meaningful number of minutes but the blower still never runs between heat and cool cycles, the problem is on the HVAC side at the blower relay rather than the thermostat.
Symptoms
- Circulate mode does not run the fan periodically
- Fan only runs during heating or cooling
- Circulate setting has no effect
- Not sure where to enable Circulate
- Fan runs far more or less than expected
- Circulate works but rooms still feel uneven
- Fan runs constantly instead of periodically
- Circulate option is missing in the app
Recognize these? Here's what usually causes it.
Common Causes
- G (fan) wire missing or not landed in the G terminal
- Circulate not enabled or set to zero minutes per hour
- Fan set to On (continuous) instead of Circulate
- Equipment not configured for fan control in the app
- G wire repurposed as the common wire
- Circulate minutes set too low to feel a difference
- System type not set correctly in the wire picker
- Blower relay fault on the HVAC side
Most fixes happen in the first 3 steps.
Always turn off your HVAC system at the breaker before removing the thermostat or touching wires. Incorrect wiring can damage both the thermostat and your HVAC equipment resulting in expensive repairs. If unsure about wiring consult an HVAC technician.
Tools & Requirements
These tools will help you complete this fix.
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Step-by-Step Solution
Enable circulate mode in the Sensi app
In the Sensi app, tap the thermostat > Fan > Circulate. Circulate mode runs the HVAC fan periodically without heating or cooling. The fan pushes air through your duct system, evening out hot and cold spots between rooms. Unlike 'On' mode (runs continuously), circulate saves energy by running only a portion of each hour. It uses the existing HVAC blower motor — no additional hardware needed.
Set the circulate duration
The circulate setting lets you choose how many minutes per hour the fan runs: typically 15, 20, 30, or 45 minutes per hour. Start at 20 minutes per hour (fan runs for 20 minutes, rests for 40). If you still notice hot/cold spots between rooms, increase to 30 minutes. During extreme weather, the fan may already run most of the hour for heating/cooling — circulate fills the remaining idle time. The cost of running the blower fan is approximately $5-15/month at average electricity rates.
Understand how circulate interacts with heating and cooling
Circulate mode runs independently from heating and cooling cycles. When the HVAC is actively heating or cooling, the fan is already on. Circulate only kicks in during the idle periods between HVAC cycles. If the system heats for 10 minutes and then idles for 20 minutes, circulate runs the fan during some of that 20-minute idle window. The system never heats or cools during circulate — it only moves existing air.
Use circulate to improve air quality
Running the fan through the HVAC system passes air through the furnace filter, removing dust, pollen, and pet dander even when the system is not heating or cooling. If you have allergies or air quality concerns, set circulate to 30-45 minutes per hour. Make sure your furnace filter is clean — a clogged filter restricts airflow and makes the blower motor work harder, increasing energy use and noise.
Disable circulate if not needed
Circulate mode adds to your electricity bill and creates fan noise. If your home has even temperatures and you do not need extra air filtration, set the fan to Auto. In Auto mode, the fan runs only during active heating or cooling cycles and is silent the rest of the time. Circulate is most beneficial in multi-story homes, homes with large temperature differences between rooms, or homes with poor duct design.
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.
Use the thermostat energy reports to find patterns in your heating and cooling usage. Setting back the temperature just 3 degrees when you leave for work can save 5 to 10 percent on your annual energy bill without any comfort sacrifice.
Thermostat issues that keep returning are often caused by stale backup-battery memory holding old settings across power cycles without the user realising.
- G (fan) wire missing or not landed in the
- Circulate not enabled or set to zero minutes per
- Fan set to On (continuous) instead of Circulate
- Equipment not configured for fan control in the app
- G wire repurposed as the common wire
Before you go — try one of these (they fix most cases).
Most popular upgrades chosen by Sensi Thermostat owners.
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Official Manufacturer Manual
Emerson Sensi provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Sensi Thermostat.
Source: sensi.emerson.com
Need More Help? Emerson Sensi Support
Note: The contact information below connects you directly to Emerson Sensi's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
