F9
Frigidaire
Blower Speed / CFM Configuration Error
Furnace flashes F9; unit may overheat or shut down unexpectedly
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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
Incorrect blower speed tap selection, Misconfigured ECM blower profile, Blocked return duct, Control board configuration error
How to Fix / Troubleshooting
Safety: Turn off power before adjusting blower wiring or dip switches.
- 1. Check filter and ducts: Replace dirty filters and inspect return ducts for collapses or blockages.
- 2. Verify blower speed taps (PSC motors): On PSC blower motors, confirm the correct speed tap is connected to HEAT on the control board per the installation manual.
- 3. ECM configuration: For ECM motors, verify dip switch or jumper settings on the control board match the furnace size and application.
- 4. Professional balancing: A technician should measure temperature rise and static pressure to ensure airflow is within Frigidaire specifications.
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Repair Difficulty
Hard
4/5
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