Poor Re-cooling After Defrost Cycle

Question

Accepted Answer

Defrost heater overheating deforms evaporator fins — reduced airflow. Check: Visually check evaporator fin deformation → measure defrost heater resistance (check for open circuit) → compare coil temperature records before/after defrost What to do: Straighten deformed fins (use fin comb) → replace heater if burned → verify coil temperature drops below +10°C after defrost Poor defrost drainage — clogged drain tray causes repeated re-freezing. Check: Check for water pooling in drain tray after defrost → inspect drain pipe heating cable for breaks → check drain for blockage What to do: Clean drain tray and drain pipe → replace drain pipe heating cable → verify fan delay time after defrost (recommended: 2–5 minutes) Defrost thermostat malfunction or defrost timer failure. Check: Verify defrost thermostat trip temperature: +10 to +13°C cutoff for standard refrigeration — faulty if outside set value What to do: Replace thermostat if faulty → re-verify defrost timer settings (cycle and duration) → check refrigerant charge to identify pull-down time anomaly

Poor Re-cooling After Defrost Cycle

Likely causes

Defrost heater overheating deforms evaporator fins — reduced airflow

Poor defrost drainage — clogged drain tray causes repeated re-freezing

Defrost thermostat malfunction or defrost timer failure

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