Evaporator Fan Failure — A One-Minute Troubleshooting Guide

The evaporator fan is the 'power fan' for heat exchange, driving air flow to help the evaporator dissipate heat. If the fan fails to rotate or runs slowly, the evaporator cannot release heat, leading to frosting. This prevents the refrigerant from fully evaporating, lowers the evaporation temperature, and creates a vicious cycle where thicker frost causes worse heat exchange. Ultimately, this results in low suction pressure and poor cooling performance.

Common Causes:

Quick Checks:

Conclusion

Address minor fan issues promptly to break the frosting vicious cycle. This ensures normal heat exchange in the evaporator, protects the compressor, and prevents long-term operation with equipment malfunctions.