F5
Klarstein
Outdoor Ambient Temperature Sensor Error
Klarstein AC shows F5 and may stop cooling or heating (for heat pump models).
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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
Defective outdoor ambient NTC sensor, sensor exposed to direct sun or heat source, wiring damage, outdoor PCB fault
How to Fix / Troubleshooting
Safety: Turn off power before accessing the outdoor unit.
Steps:
- Locate sensor: The outdoor ambient sensor is usually mounted near the outdoor coil or on the chassis, away from direct coil heat.
- Check placement: Ensure it is not touching hot discharge pipes or in direct sunlight. Reposition if necessary.
- Inspect wiring: Look for damage or corrosion at the connector. Clean and reseat.
- Test sensor: Measure resistance and compare to expected NTC values. Replace if faulty.
If F5 persists, the outdoor PCB’s sensor circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outdoor Ambient NTC Sensor
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