H3
Honeywell
Compressor Overload Protection / High Temperature Trip
Honeywell AC/heat pump displays H3 and shuts down heating or cooling.
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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 airflow, Failed condenser fan motor, Overcharged or undercharged refrigerant, Failing compressor
How to Fix / Troubleshooting
Safety: Unplug the unit and allow it to cool. Do not repeatedly restart a unit with compressor overload faults.
Steps:
- Check airflow: Clean filters and coils, ensure vents are not blocked, and verify the exhaust hose (portable) is properly installed.
- Verify fan operation: Confirm that the condenser/outdoor fan runs whenever the compressor is on. Replace the fan motor if it fails to start or runs slowly.
- Ambient temperature: Avoid operating the unit outside its specified temperature range.
- Professional diagnosis: If H3 recurs despite good airflow and fan operation, have an HVAC technician check refrigerant charge and compressor condition.
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Repair Difficulty
Professional Required
5/5
Required Part
Condenser Fan Motor
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