F3
Payne
Ignition/Flame Fault (for Payne gas/electric packaged AC with heat) or General Safety Lockout
Payne air conditioner control board shows F3; system may lock out after several failed starts.
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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
Flame sensor contamination (in gas heat mode), Faulty ignition control, Multiple safety trips (pressure switches, limit switches)
How to Fix / Troubleshooting
Warning: This involves gas and ignition components. If you smell gas, evacuate and call your gas utility immediately.
- 1. Reset lockout: Turn the thermostat to OFF. Cut power to the unit for 5 minutes, then restore power and call for cooling or heating as appropriate.
- 2. Observe operation (heat mode): If F3 appears during heating, watch the ignition sequence through the sight glass. If burners light then go out, the flame sensor may be dirty.
- 3. Clean flame sensor (if accessible): With gas and power OFF, remove the flame sensor and gently clean the metal rod with fine steel wool or emery cloth. Reinstall and test.
- 4. Check filters and vents: Ensure return filters are clean and that combustion air and exhaust vents are not blocked.
- 5. Call a technician: If F3 persists, a professional should test all safety switches, ignition control, and gas pressures.
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Repair Difficulty
Hard
4/5
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