Defrost Timer Interval Too Long → Increasing Frost Thickness

Question

Accepted Answer

Defrost interval set to 6 hours — too long for actual frost accumulation rate, frost thickness exceeds 5mm. Check: Visually check frost thickness between evaporator fins — ≥5mm requires shorter interval What to do: Shorten defrost interval from 6 hrs to 3 hrs → recheck frost next day and repeat adjustment Increased door open frequency or high humidity environment change not accounted for. Check: Measure outdoor humidity — if >80% RH, increase defrost frequency. Check door opening log What to do: During summer/rainy season (humidity >80%), increase defrost frequency from 2 to 4 times per day Analog timer clock drift — long-term use causes ±30 min actual interval deviation. Check: Time actual defrost start with stopwatch over 3 consecutive cycles → replace timer if >30 min deviation from setting What to do: Replace analog timer with digital timer (ELIWELL, Carel, etc.) — achieves ±1 min accuracy

Defrost Timer Interval Too Long → Increasing Frost Thickness

Likely causes

Defrost interval set to 6 hours — too long for actual frost accumulation rate, frost thickness exceeds 5mm

Increased door open frequency or high humidity environment change not accounted for

Analog timer clock drift — long-term use causes ±30 min actual interval deviation

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