F3
Bosch
Outdoor Discharge Pipe Temperature Sensor Fault
F3 appears and the unit may not defrost properly in heating mode or may shut down.
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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
Open or shorted discharge pipe NTC sensor, Sensor detached from discharge line, Damaged sensor harness, Faulty outdoor PCB input
How to Fix / Troubleshooting
Safety first: Turn off power before accessing the outdoor unit.
Steps:
- Locate discharge sensor: It is typically strapped to the compressor discharge pipe inside the outdoor unit.
- Verify mounting: Ensure the sensor is tightly attached to the pipe with the original clip or strap and insulated if originally covered.
- Check wiring: Inspect the harness from the sensor to the PCB for damage or loose connectors.
Resolution: Replace the discharge pipe sensor if damaged. If the F3 code persists, the outdoor control board may need replacement by a Bosch technician.
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Repair Difficulty
Hard
4/5
Required Part
Discharge Pipe Temperature Sensor
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