E12
Toshiba
Indoor Heat Exchanger Overheat / Freeze Protection Error
Unit displays E12; may be associated with abnormal indoor coil frost or overheating.
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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
Blocked air filter and coil, Failed indoor coil sensor, Low refrigerant charge, Indoor fan not running at correct speed
How to Fix / Troubleshooting
Safety first: Turn off power before cleaning or accessing internal parts.
- Step 1 – Clean filters: Remove and wash the air filters with mild detergent. Dry completely before reinstalling.
- Step 2 – Clean indoor coil: Inspect the evaporator coil for heavy dust. Use a soft brush and vacuum or a coil cleaner approved for AC units.
- Step 3 – Check indoor fan operation: Restore power and run the unit. Ensure the fan runs at all selected speeds. If weak or intermittent, suspect the fan motor.
- Step 4 – Inspect coil sensor: Verify the indoor coil thermistor is properly attached to the coil and its wiring is intact.
- Step 5 – Professional refrigerant check: If airflow and sensor are good but E12 persists, a technician should check refrigerant charge and system pressures.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Evaporator Temperature Sensor (Thermistor)
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