H3
Senville
Compressor Overload Protection / Overheat
Indoor unit shows H3; compressor stops and system shuts down to protect itself.
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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
Dirty coils causing high pressure, Blocked outdoor airflow, Low refrigerant charge or overcharge, Failing compressor or stuck reversing valve
How to Fix / Troubleshooting
Safety: Turn off power before cleaning or inspecting components.
- Step 1 – Clean indoor and outdoor coils: Wash filters, vacuum indoor coil, and rinse outdoor coil as described in other entries.
- Step 2 – Check airflow: Ensure no obstructions around outdoor unit and that indoor supply/return vents are open.
- Step 3 – Allow cool-down: Leave the system off for 30–60 minutes to let the compressor cool, then restart.
- Step 4 – Monitor operation: If H3 returns quickly, a technician should check refrigerant pressures and compressor condition.
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Repair Difficulty
Hard
4/5
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