F3
Blaupunkt Evaporator Low Temperature Protection / Sensor Abnormality

Unit shows F3; may run but with poor performance or incorrect defrosting.

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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

Evaporator sensor reading too low due to sensor fault, Restricted airflow across indoor coil, Low refrigerant charge causing coil freeze, Sensor not properly attached to coil

How to Fix / Troubleshooting

Safety first: Turn off power before opening the indoor unit.

Steps:

  • Check filters and coil: Remove and clean air filters. Inspect the evaporator coil for ice buildup or heavy dust. Allow any ice to melt completely and clean the coil with a soft brush.
  • Verify sensor placement: Ensure the evaporator sensor is firmly clipped to the coil where Blaupunkt originally placed it.
  • Test sensor: Measure resistance and compare to spec. Replace if out of range.
  • Check for low charge: If the coil repeatedly ices up and F3 appears, the system may be low on refrigerant or have poor airflow. A technician should check refrigerant pressures and fan performance.
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Repair Difficulty

Medium 3/5

Required Part

Evaporator Temperature Sensor / Indoor Coil
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