H3
SMEG
Compressor Overload / Overheat Protection (Non-sensor)
H3 error; compressor stops and unit shuts 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
Blocked outdoor coil, High ambient temperature with poor ventilation, Overcharged refrigerant, Failing compressor internal overload
How to Fix / Troubleshooting
Safety first: Turn off power before cleaning or inspecting the outdoor unit.
- Clean outdoor coil thoroughly: Use low-pressure water and a coil cleaner if necessary.
- Improve ventilation: Ensure the outdoor unit is not installed in a confined space without airflow.
- Check fan operation: Confirm the outdoor fan runs at full speed when the compressor is on.
- Allow cooling time: Let the unit cool for 30–60 minutes before restarting.
If H3 recurs, a technician must check refrigerant charge and compressor condition.
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Repair Difficulty
Hard
4/5
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