F25
Saunier Duval
Flue Gas Recirculation / CO Protection
Furnace displays F25, burner shuts down, may be associated with flue gas recirculation
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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 flue installation,Blocked or damaged flue terminal,Strong wind causing flue gas blowback,Defective flue gas sensor
How to Fix / Troubleshooting
Critical safety warning: F25 can indicate dangerous flue gas conditions. Do not operate the furnace until the flue system has been checked by a qualified technician.
- Visual flue check: From outside, ensure the flue terminal is correctly positioned and unobstructed. Look for signs of damage or incorrect proximity to openings.
- Check surroundings: Remove any objects near the flue terminal that could cause recirculation of exhaust gases.
- Sensor inspection: A technician should inspect and test the flue gas sensor and replace it if faulty.
- Flue system inspection: Have a certified professional inspect the entire flue for compliance, integrity, and correct routing.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Gas Sensor
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