E18
Westinghouse
High-Temperature Alarm Circuit Fault
E18 error; high-temperature alarm may sound continuously even when the freezer is cold.
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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
Faulty alarm buzzer circuit, Stuck alarm relay, Sensor misreading due to wiring fault, Control board failure
How to Fix / Troubleshooting
Safety: Unplug the freezer before removing control covers.
Steps:
- Confirm actual temperature: Use a separate thermometer to ensure the freezer is at or below the setpoint.
- Check sensors: Verify cabinet and evaporator sensors are correctly mounted and reading plausible values.
- Inspect control board: Look for damage around the alarm/buzzer circuit. If the buzzer is stuck on due to a shorted component, the board must be replaced.
- Temporary silencing: Some models allow muting the alarm via the control panel. Use this only as a temporary measure until the fault is repaired.
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Repair Difficulty
Medium
3/5
Required Part
Main Control Board
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