R-Pro › Field cases › Refrigeration systems
Evaporator Fan Blade Contacting Frost
Likely causes
Defrost system failure causing excessive frost
Check: Cut power and manually defrost (warm air or natural thawing)
What to do: Cut power and manually defrost (warm air or natural thawing) → Test defrost heater continuity and resistance → Verify defrost timer/controller operation → Check fan blade for deformation → Confirm noise is gone after restart
Frost accumulating in tight clearance between fan and coil
Check: Test defrost heater continuity and resistance
What to do: Test defrost heater continuity and resistance → Verify defrost timer/controller operation → Check fan blade for deformation → Confirm noise is gone after restart
Frost is contacting the fan blade causing noise. Manually defrost, then inspect the defrost system.
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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