10
American Standard
Flame Sense Microampere Out of Range / Nuisance Flame Loss
Error code 10: Furnace cycles on and off rapidly without reaching the set temperature.
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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
Weak flame signal due to dirty burners, improper polarity or neutral-ground issue, aging flame sensor with poor conductivity, low manifold gas pressure on American Standard gas valve.
How to Fix / Troubleshooting
Safety: Turn off power and gas before cleaning burners or working on wiring.
Error 10 indicates marginal flame sensing, causing intermittent shutdowns.
- Clean burners:
- Remove the burner rack according to American Standard service instructions.
- Brush off rust and debris; clear burner ports with compressed air (outdoors).
- Reinstall, ensuring proper alignment into the heat exchanger inlets.
- Verify electrical polarity:
- At the furnace disconnect, ensure hot and neutral wires are correctly connected.
- Incorrect polarity can weaken flame sensing; have an electrician correct any issues.
- Replace flame sensor if cleaning fails:
- Install an OEM flame sensor designed for your American Standard model.
- If problems persist, a technician should measure flame sensor microamps and adjust gas pressure if needed.
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Repair Difficulty
Hard
4/5
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