Indoor unit shows P3; unit may not start or may run intermittently; often related to outdoor ambient or coil temperature limits.

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

Extreme outdoor temperatures beyond operating range, Faulty ambient or coil sensor, Blocked outdoor coil, Incorrect installation location

Safety: Turn off power before working on the outdoor unit.

Steps:

1. Check ambient conditions: Compare current outdoor temperature with the Airwell unit's specified operating range.
2. Inspect sensors: Verify outdoor ambient and coil sensors are correctly mounted and wiring is intact (see F1 and F2).
3. Clean coil and ensure airflow: Remove obstructions and clean the outdoor coil.
4. Professional diagnosis: If P3 occurs under normal temperatures, a technician should test sensor values and PCB operation.

Medium 3/5

Outdoor Ambient or Coil Temperature Sensor

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