Heater shows E01 and will not start; often on heat pump models.

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

Low refrigerant charge, Blocked evaporator coil reducing airflow, Faulty low-pressure switch, Refrigerant leak in AstralPool heat pump circuit

Safety first: Turn off power. Refrigerant systems must be serviced by licensed technicians.

Check water flow: Ensure pool water flow is within the specified range; very low flow can cause abnormal pressures.
Inspect evaporator coil: On heat pump models, check the outdoor coil for leaves, dirt, or blockage. Gently hose off debris from the coil fins.
Ensure fan operation: Confirm the outdoor fan runs when the unit calls for heat.

If E01 persists, a licensed refrigeration technician must check refrigerant pressures and repair any leaks.

Professional Required 5/5

AstralPool Low-Pressure Switch

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