E413
Lennox
Evaporator Coil Freeze-Up
Lennox system displays E413 evaporator freeze protection or low coil temperature fault; coil may be iced over and airflow is weak.
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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
Low refrigerant charge, Restricted airflow from dirty filter or coil, Blower not running at commanded speed, Faulty TXV causing low superheat
How to Fix / Troubleshooting
Safety: Turn off cooling at the thermostat and leave the indoor fan set to ON to thaw the coil. Do not chip ice off the coil.
- 1. Thaw the system: Allow several hours for all ice to melt. Place towels or a pan under the air handler if necessary to catch excess water.
- 2. Replace filter and check vents: Install a clean filter and ensure all vents are open. Restricted airflow is a common cause of freeze-up.
- 3. Inspect coil cleanliness: Once thawed, inspect the evaporator coil. Clean as needed with a soft brush and coil cleaner.
- 4. Restart and monitor: After cleaning and restoring airflow, restart cooling. If the coil begins to ice again or E413 returns, shut the system down and schedule a technician to check refrigerant charge and TXV operation.
Important: Repeated freeze-ups can damage the compressor and cause water damage around the air handler.
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Repair Difficulty
Medium
3/5
Required Part
Lennox Evaporator Coil Temperature Sensor
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