System displays CH24 and stops operating, often during heavy load or high ambient temperature.
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.
Possible Causes
How to Fix / Troubleshooting
Safety: Turn off power before cleaning or working near the outdoor fan. Do not attempt to open the refrigerant circuit without proper certification.
User-level steps:
- Clean outdoor coil: Remove leaves, dirt, and debris from the coil fins. Use a garden hose with gentle pressure from inside out (if accessible) to wash the coil. Do not bend fins.
- Check outdoor airflow: Ensure at least 12–24 inches of clearance around the unit. Remove obstructions (plants, covers, stored items).
- Verify fan operation: With power restored, observe the outdoor fan. It should start and run whenever the compressor is running. If the fan does not run, turn power off and do not continue to operate the unit.
- Reset: After cleaning and ensuring airflow, power the system off for 10 minutes, then on, and test.
Technician tasks: If CH24 persists, a technician should check refrigerant charge, system pressures, and verify that all service valves are fully open and that there are no restrictions in the refrigerant circuit.
Repair Difficulty
Required Part
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