Pool heat pump stops heating and displays E02; fan may run but compressor shuts down.

Safety first: Switch off power at the breaker and unit disconnect before inspection. Do not attempt to connect gauges or add refrigerant unless you are licensed.

• Check airflow through evaporator coil: Ensure the top fan is running and there is no obstruction above the unit. Remove leaves, covers, or snow around the air inlet and outlet.
• Clean coil surface: With power off, remove large debris from the coil fins and gently rinse with a garden hose. Allow to dry before restarting.
• Verify water flow: Confirm that the circulation pump is running and that the SPRSUN heater has adequate flow (no closed valves, clean filter). Poor heat transfer can cause low suction pressure.
• Restart and monitor: Restore power and clear the E02 alarm. If the code reappears within minutes, the system may be low on refrigerant or have a restriction.
• Call a technician: A professional should check the low pressure switch, inspect for refrigerant leaks, and verify the electronic expansion valve (EEV) or capillary system operation.