Whirlpool dishwasher not draining is a known issue affecting WDT730PAH series. Our technicians specialize in Whirlpool-specific diagnostics and repair.
Whirlpool dishwasher not draining is typically caused by clogged drain hose or failed drain pump. Whirlpool-specific factor: chopper blade blockage in sump — hard food debris jams the macerator. Repair costs $100-$250 with free diagnostic and 90-day warranty.
Chopper blade blockage in sump — hard food debris jams the macerator
Drain solenoid failure preventing drain valve from opening
Drain motor/pump assembly burnout from extended blockage
Check ball valve stuck from grease and mineral accumulation
Garbage disposal knockout plug not removed during installation
Other Whirlpool models may also be affected. Book a free diagnostic for confirmation.
Seeing one of these codes? It likely indicates not draining.
Sacramento hard water deposits calcium on the Whirlpool chopper blade and check ball valve, reducing drain efficiency progressively over 12-24 months. Newer construction in Natomas and Rancho Cordova uses standard plumbing that is correctly installed, but mineral scale still accumulates faster than in soft-water markets. Quarterly rinse-aid treatment helps keep drain components clear.
Remove lower spray arm and cylindrical filter — inspect chopper blade area for hard food debris (bones, fruit pits, glass fragments)
Check garbage disposal connection: disconnect drain hose, verify knockout plug was removed (use flashlight inside disposal inlet)
Run Whirlpool diagnostic drain cycle: press Heated Dry + Normal + Heated Dry + Normal within 6 seconds — advance to drain step
Test drain solenoid with multimeter — should read 30-40 ohms; infinite reading means coil is open and solenoid needs replacement
The technician removes the filter and sump assembly to inspect the chopper blade area. Hard debris is cleared and the blade is tested for free rotation. If the drain solenoid has failed, it is replaced on the drain valve body — a 30-minute repair with the unit pulled out. The technician also checks the air gap and disposal connection, removing any forgotten knockout plug if present.
| Diagnostic | Free |
| Typical repair | $100–$250 |
| Repair time | 1-1.5 hours |
| Warranty | 90 days parts + labor |
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