E11
Nest
Indoor Blower Fan Call Circuit Fault (G)
Nest thermostat displays E11 and reports a problem with the fan (G) wire or fan control
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose or disconnected G wire at Nest base, Loose G wire at furnace control board, Blown low‑voltage fuse due to short on G to C, Faulty blower relay on furnace control board
How to Fix / Troubleshooting
Safety: Turn off power to the furnace/air handler at the breaker before working on wiring or control boards.
- Check G at Nest: Remove the Nest display and verify the G wire is fully inserted and clamped.
- Inspect furnace board: Confirm the thermostat G conductor is attached securely to the G terminal on the control board.
- Fuse check: Inspect and replace the low‑voltage fuse if blown. If it blows again when the fan is called, there may be a short on the G circuit.
- Fan test: With the Nest removed, temporarily jumper R to G at the furnace control board (with power on) to see if the blower runs. If it does not, the blower relay or motor circuit may be faulty.
- Professional service: If the blower does not respond to a direct R‑G jumper, contact an HVAC technician to diagnose the control board and blower motor.
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Repair Difficulty
Hard
4/5
Required Part
G Fan Call Wire or Furnace Control Board (Blower Relay)
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