11 FLASH
Tappan
Limit Circuit Lockout / Exceeded Retry Attempts
Furnace does not respond to thermostat; LED flashes 11 times repeatedly.
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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
Chronic overheating due to undersized ductwork, repeatedly opening high limit switch, blocked return air on Tappan furnace, defective limit switch wiring
How to Fix / Troubleshooting
Safety: Turn off power before working inside the furnace.
Steps:
- Inspect and replace the air filter. Verify that return air grilles are not blocked and that doors to mechanical rooms are not sealed shut.
- Check all high limit switches for proper mounting and good contact with the heat exchanger panel.
- Inspect ductwork near the furnace for crushed or disconnected sections that could restrict airflow.
- Reset the control by turning power off for 30 seconds. If the furnace quickly overheats again and locks out, professional evaluation of duct sizing and blower speed is recommended.
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Repair Difficulty
Hard
4/5
Required Part
High Limit Switch
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