H3
Airwell
Compressor Overheat Protection
Indoor unit displays H3; compressor stops; unit may not restart until cooled.
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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, Low refrigerant causing high discharge temperature, Overcharged system, Faulty discharge sensor
How to Fix / Troubleshooting
Safety: Turn off power at the breaker. The compressor and discharge line can be very hot.
Steps:
- 1. Check outdoor fan: Confirm the outdoor fan runs when the unit is on. If not, troubleshoot the fan motor (see E7).
- 2. Clean outdoor coil: Remove debris and dirt from the condenser coil. Use a soft brush or low-pressure water, avoiding damage to fins.
- 3. Ensure clearance: Make sure there is adequate space around the outdoor unit for airflow (typically at least 30–50 cm on sides and more above).
- 4. Inspect discharge sensor: Check the compressor discharge sensor placement and wiring (see F3).
- 5. Professional refrigerant check: If H3 recurs after airflow issues are corrected, a technician must check refrigerant charge and system pressures.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Fan Motor or Compressor Discharge Sensor
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