Unit shows E15 and stops; may be associated with abnormal compressor noise or vibration.

Safety first: Disconnect power before inspection. Do not attempt to adjust refrigerant charge yourself.

• Check airflow: Ensure nothing is blocking the top discharge or side inlets. Maintain recommended clearances around the SPRSUN heater.
• Clean condenser coil: Gently rinse the coil fins with a garden hose to remove dirt and debris.
• Verify fan operation: Confirm that the fan starts and runs at normal speed when the unit operates.
• Inspect sensor: Locate the discharge temperature sensor on the compressor discharge line. Make sure it is firmly attached and the wiring is intact.
• Call a technician: If E15 persists, a professional should check discharge temperature, system pressures, and refrigerant charge, and replace the sensor if faulty.