F5
AEG
High or Low Pressure Protection (Model-dependent)
F5 displayed; unit may shut down during extreme temperatures or heavy load.
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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
Blocked condenser coil, Failed outdoor fan, Refrigerant undercharge or leak, Blocked expansion device, Faulty high/low pressure switch
How to Fix / Troubleshooting
Safety: Refrigerant circuits are pressurised and must only be opened by certified technicians. Do not attempt to connect gauges or add gas yourself.
- Check airflow: Clean the outdoor coil and ensure at least 30 cm clearance around the unit. Remove any covers or obstructions.
- Verify fan operation: Confirm the outdoor fan runs whenever the compressor is operating. If not, see fan motor diagnostics.
- Look for icing: Ice on the outdoor or indoor coil can indicate low refrigerant or airflow issues. Turn the unit off to allow ice to melt.
- Reset: After cleaning and thawing, power cycle the unit and test. If F5 returns, a pressure-related fault is likely.
- Call a technician: A qualified AEG technician should check system pressures, leak-test, and verify the operation of any pressure switches or sensors.
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Repair Difficulty
Professional Required
5/5
Required Part
High/Low Pressure Switch or Sensor
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