R-Pro › Field cases › Refrigeration systems
Evaporator Fan Motor Burnout
Likely causes
Fan blade seized by coil icing — overload burnout
Check: Manually rotate fan blade — cannot rotate = iced and seized; measure motor insulation resistance — below 1MΩ = burned
What to do: Defrost coil then verify fan blade rotation; replace motor if burned (same W/rpm/blade count); verify insulation resistance above 1MΩ after replacement
Fan restarted before defrost ends — motor exposed to heater heat
Check: Check fan delay timer setting — 3~5 min delay is normal; without delay, heater high heat can damage motor windings
What to do: Verify and set fan delay timer to 3~5 min; replace motor if burned
Voltage instability — motor overheating
Check: Measure fan motor supply voltage — normal within ±10% of rated; sustained low voltage causes motor overcurrent → burnout
What to do: Add voltage stabilizer; inspect power wiring; verify voltage is normalized before replacement
Always check for coil icing before replacing fan motor — if icing cause is not resolved, the replacement motor will burn out the same way; memorize insulation resistance standard of 1MΩ
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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