SFS
Jandy
Flue Gas Temperature Sensor Fault
Display shows SFS or stack flue sensor error; heater may shut down after running briefly.
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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
Failed stack flue sensor, Overheating flue due to restricted exhaust, Loose sensor wiring, Control board sensor input failure
How to Fix / Troubleshooting
Safety first: Turn off power and gas. High flue temperatures can be hazardous.
- Inspect vent: Check the exhaust vent for obstructions or improper installation that could cause high flue temperatures.
- Check sensor: Locate the stack flue sensor in the exhaust outlet. Inspect for damage or discoloration. Ensure wiring is intact and connector is tight.
- Replace sensor: If the sensor is out of specification or physically damaged, replace it with the correct Jandy stack flue sensor.
- If SFS persists: The control board may be misreading the sensor; have a technician test and replace the board if necessary.
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Repair Difficulty
Hard
4/5
Required Part
Stack Flue Sensor
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