H3
Westinghouse
Compressor Overload Protection / High Temperature Trip
Unit displays H3 and shuts down heating or cooling; outdoor unit may be very hot.
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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, failed outdoor fan motor, overcharged or undercharged refrigerant, compressor internal fault, faulty overload sensor
How to Fix / Troubleshooting
Safety: Turn off power before inspecting the outdoor unit. Components may be very hot.
Steps:
- Check outdoor airflow: Remove leaves, dirt, and obstructions from around the outdoor unit. Clean the condenser coil with low-pressure water.
- Verify fan operation: Restore power briefly and confirm the outdoor fan starts and runs at full speed. If not, troubleshoot the fan motor and capacitor.
- Allow cooling: Let the unit cool for at least 30 minutes, then restart. If H3 returns quickly, an internal compressor or refrigerant issue is likely.
- Professional checks: A technician should measure operating pressures, check refrigerant charge, and test compressor windings and overload sensor.
Warning: Do not bypass overload protection; this can cause permanent compressor damage or fire.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Fan Motor
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