EC
Westinghouse Refrigerant Leak Detection / Low Pressure Protection

Display shows EC and unit may run briefly then shut down; often associated with poor cooling.

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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.

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Possible Causes

Leak in indoor coil, outdoor coil, or line set, loose flare nuts, damaged service valves, factory undercharge

How to Fix / Troubleshooting

Safety: Do not attempt to tighten refrigerant fittings or open the system without proper tools and certification.

User-level actions:

  • Visual inspection: Look for oily residue on coils, line set, and connections, which indicates a refrigerant leak.
  • Check airflow: Ensure filters and coils are clean to rule out airflow-related issues.
  • Reset: Power the unit off for 10 minutes, then restart. If EC reappears, stop using the unit.

Professional service required: A licensed HVAC technician must locate and repair leaks, evacuate, and recharge the system with the correct refrigerant and charge weight.

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Repair Difficulty

Professional Required 5/5

Required Part

Indoor Evaporator Coil
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