F9
Liebherr
Ambient Temperature Sensor Fault
Display shows F9; interior temperatures may drift, and the unit may not defrost correctly.
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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
Failed ambient NTC sensor, Sensor dislodged from mounting point, Damaged cable in rear harness, Corroded connector at control board
How to Fix / Troubleshooting
Safety first: Disconnect mains power before accessing rear panels.
Step-by-step:
- Locate ambient sensor: On many Liebherr models, the ambient sensor is mounted at the rear of the cabinet or near the condenser area, sensing room temperature.
- Inspect sensor and wiring: Look for physical damage, crushed cables, or signs of rodent damage in the rear compartment.
- Connector check: Follow the cable to the main control board and reseat the connector.
- Test sensor: Measure resistance with a multimeter and compare to expected NTC values at room temperature. Replace if open/shorted or far out of range.
- Install replacement: Fit a new Liebherr ambient NTC sensor in the same location, ensuring it is not touching hot components like the compressor.
- Reassemble and test: Restore power and monitor operation over 24 hours to confirm F9 does not return.
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Repair Difficulty
Medium
3/5
Required Part
Ambient Temperature NTC Sensor
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