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Condenser Fan Motor Failure

Likely causes

Fan motor coil break or burnout

Check: High-pressure trip within 5 min of fan stopping = fan failure 99%; measure fan motor coil resistance (break: ∞); insulation resistance below 1MΩ = burned

What to do: Replace with same spec fan motor; after replacement, measure high pressure — R-404A @40°C normal 1.6~1.8 MPa; if abnormal, also clean condenser

Fan overload from condenser fin contamination

Check: Visually inspect condenser fin condition — dust/oil blockage extent; measure high pressure — above 2.0 MPa = condensing failure

What to do: Spray fin cleaner then reverse flush with water; ensure minimum 15cm ventilation clearance; remeasure fan motor current

Startup failure from capacitor failure

Check: Measure capacitor capacitance — normal within ±10% of rated; 0 or excessive = failure; if fan rotates manually but won't start = capacitor failure

What to do: Replace with same capacitance capacitor; verify with startup current measurement after replacement

Field tip

High-pressure trip within 5 min of fan stop = 99% fan failure — diagnose against R-404A @40°C normal 1.6~1.8 MPa; manually rotates = capacitor issue; won't rotate = coil failure

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