H3
Tosot
Compressor Overload Protection / Overheat
Indoor unit shows H3, system shuts down to protect compressor
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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
High ambient temperature and poor ventilation, Dirty condenser coil, Failing compressor, Incorrect supply voltage
How to Fix / Troubleshooting
Safety first: Disconnect power at the outdoor disconnect.
- Improve ventilation: Ensure the outdoor unit has adequate clearance and is not in a confined space.
- Clean condenser coil: Wash the coil to restore heat rejection.
- Check fan operation: Verify the outdoor fan runs properly.
- Allow cool-down: Let the unit sit powered off for 30–60 minutes, then restart.
- If H3 recurs: Professional diagnosis of compressor current draw and refrigerant pressures is required.
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Repair Difficulty
Professional Required
5/5
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