R-Pro › Field cases › Chillers

High Pressure Rise from Condenser Fan Failure

Likely causes

Fan motor winding open or burned out

Check: Confirm voltage is applied to fan motor terminals

What to do: Confirm voltage is applied to fan motor terminals → Measure capacitor capacitance (within ±10% of rated) → Try to turn fan blade by hand (seized = bearing failure or foreign object) → Measure motor winding resistance (open circuit = ∞) → Replace fan motor or capacitor with same specification

Start capacitor faulty

Check: Measure capacitor capacitance (within ±10% of rated)

What to do: Measure capacitor capacitance (within ±10% of rated) → Try to turn fan blade by hand (seized = bearing failure or foreign object) → Measure motor winding resistance (open circuit = ∞) → Replace fan motor or capacitor with same specification

Fan blade blocked by foreign object causing overload stop

Check: Try to turn fan blade by hand (seized = bearing failure or foreign object)

What to do: Try to turn fan blade by hand (seized = bearing failure or foreign object) → Measure motor winding resistance (open circuit = ∞) → Replace fan motor or capacitor with same specification

Field tip

The condenser fan is not operating, preventing heat rejection. Replace the fan motor or capacitor. Always cut power before inspecting the fan motor. The fan may restart unexpectedly.

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