Defrost Water Drainage Blockage

Question

Accepted Answer

Drain heater break — drainage pipe frozen and blocked. Check: Measure drain heater resistance — calculate based on 20W/m rating; open circuit = break; check drain pan for ice What to do: Replace drain heater; thaw drain pan and drainage with hot water before restarting Drain pipe slope insufficient or clogged. Check: Check drain pipe slope — minimum 1/50 (2%) required; visually inspect for hose kinks and blockage; observe drainage flow during defrost What to do: Re-route pipe to ensure slope; replace kinked section; flush blocked section with acid cleaner Scale/slime accumulation in drain pan. Check: Visually inspect drain pan — check scale/slime thickness; if defrost water pools and overflows in pan = blockage confirmed What to do: Remove and clean drain pan with acid cleaner; clear drain hole with thin wire; confirm minimum 4 times/day 30-min defrost

Defrost Water Drainage Blockage

Likely causes

Drain heater break — drainage pipe frozen and blocked

Drain pipe slope insufficient or clogged

Scale/slime accumulation in drain pan

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