Removable white film in the WDT720PADW often comes from hard-water minerals or detergent; rinse aid, dosage and cleaning are the first checks. Confirm the visible symptom before resetting; filters, loading, detergent, water supply and door alignment are safe checks, internal wiring is not. Hard water, empty rinse aid, excessive detergent or mineral buildup inside the tub can leave spots and film. Film that wipes off differs from permanent rough etching; test only a small hidden area before changing settings. Fill rinse aid, use a fresh measured automatic-dishwasher detergent and clean the interior with a manufacturer-approved cleaner according to its label. Recheck after several normal cycles. If film persists despite corrected water care, test hardness or contact support.
Models covered
Safety first
- Cancel, switch off, close the water valve and let hot dishes cool. Wear gloves near the filter; never tilt a built-in appliance or remove its base or side panels.
What the symptom may indicate
Checks in the right order
- Confirm before acting
Hard water, empty rinse aid, excessive detergent or mineral buildup inside the tub can leave spots and film.
- Make the appliance safe
Cancel, switch off, close the water valve and let hot dishes cool. Wear gloves near the filter; never tilt a built-in appliance or remove its base or side panels.
- Apply the official check
Fill rinse aid, use a fresh measured automatic-dishwasher detergent and clean the interior with a manufacturer-approved cleaner according to its label.
- Retest once and decide
Recheck after several normal cycles. If film persists despite corrected water care, test hardness or contact support.
Stop and get qualified help when
- Stop for water in the base, an uncontrolled leak, heat or motor code, burning smell, damaged cable or a fault that returns after one empty test.
Next step
Repair, replace a part, or arrange a diagnosis?
Use the checks and stop conditions above to choose a cautious next step. A symptom alone never proves that the appliance has failed.
Resolve it without buying anything
Complete the 4 user-accessible checks in order. If normal operation returns and no warning sign remains, no replacement is indicated.
Replace only the confirmed part
If the checks isolate a worn or blocked component, match its complete reference to the exact appliance model before ordering.
This guide does not identify a replacement part. Do not order a generic component from the symptom alone.
Arrange a diagnosis before replacing the appliance
Stop at any warning sign listed above. A qualified diagnosis should confirm that repair is unsafe, unavailable or uneconomical before an appliance replacement is considered.
Sources used
- Whirlpool — Whirlpool's official support material documents this exact symptom path for WDT720PADW; the procedure here keeps only user-accessible checks.
Last checked: 30 August 2026