L1
Monogram
Low Temperature Condition / Overcooling
Freezer displays L1 or a low temperature alarm; interior may be much colder than setpoint, sometimes causing excessive frost.
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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
Stuck or shorted temperature sensor, main control board temperature calibration fault, failed damper (on combo units), relay on control board stuck closed
How to Fix / Troubleshooting
Safety: Disconnect power before accessing sensors or control boards.
- Verify setpoint: Confirm the temperature setting is not accidentally set to the coldest level.
- Check sensor: Test the freezer thermistor as described in E2. A shorted sensor can cause the control to overcool.
- Inspect control board: Look for signs of damage or corrosion on the main control board.
- Reset control: Power off at the breaker for 5–10 minutes, then restore. If overcooling resumes and the sensor is good, the control board may be defective.
Persistent overcooling with a good thermistor usually requires replacement of the main control board by a qualified technician.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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