13 FLASH
Tappan
Limit Circuit Open for Extended Time
LED flashes 13 times; furnace may not start or may shut down mid-cycle.
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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
Persistent high temperature in heat exchanger, failed limit switch stuck open, blocked secondary heat exchanger on high-efficiency Tappan models, blower motor failure
How to Fix / Troubleshooting
Safety: Turn off power and gas. Allow furnace to cool fully.
Steps:
- Verify blower operation in FAN ON mode at the thermostat. If the blower does not run, troubleshoot the blower motor, capacitor, and relay.
- Check the primary and secondary heat exchangers (if condensing model) for heavy dust buildup or signs of internal blockage. This typically requires a professional cleaning.
- Test the main limit switch for continuity at room temperature. Replace if it remains open.
- After correcting airflow and replacing any faulty limits, reset power and monitor operation. If the code returns, have a technician check temperature rise and gas input.
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Repair Difficulty
Professional Required
5/5
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