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WarningEvaporators & Cases

Evaporator Fan Blade Icing / Imbalance

Ice builds on the fan blades and shroud, unbalancing the fan — airflow drops, the case warms, and the motor runs loud and hot.

Symptoms
  • Loud vibration, rattle or 'whump' from the evaporator fan
  • Visible ice on the blades, orifice ring or fan shroud
  • Reduced airflow and a slowly warming case despite the compressor running
  • Fan motor hot — may later trip on its Klixon
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Likely causes, step-by-step troubleshooting & safety notes

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Related faults
Evaporator Coil Icing / Frost Build-UpEvaporator Fan Motor Klixon Trip (Thermal Overload)Defrost Not Working
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For qualified refrigeration technicians. Always follow manufacturer procedures and local codes. R-290 (propane) and other flammable refrigerants require A3-rated tools and safety practices.