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Evaporator Fan Motor Burned Out / Faulty

Likely causes

Motor burned out from bearing seizure

Check: Measure winding resistance (check for open/short)

What to do: Measure winding resistance (check for open/short) → Measure insulation resistance (case to terminal; ≥1MΩ) → Prepare replacement of same spec (voltage, wattage, RPM, shaft direction) → Decide if blade needs replacement, then replace motor → Measure current after replacement to confirm normal

Insulation breakdown from frost or condensate

Check: Measure insulation resistance (case to terminal; ≥1MΩ)

What to do: Measure insulation resistance (case to terminal; ≥1MΩ) → Prepare replacement of same spec (voltage, wattage, RPM, shaft direction) → Decide if blade needs replacement, then replace motor → Measure current after replacement to confirm normal

Burnout from voltage imbalance or overvoltage

Check: Prepare replacement of same spec (voltage, wattage, RPM, shaft direction)

What to do: Prepare replacement of same spec (voltage, wattage, RPM, shaft direction) → Decide if blade needs replacement, then replace motor → Measure current after replacement to confirm normal

Field tip

Evaporator fan motor is faulty. Replace with a motor of the same specification.

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