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Thermador Dishwasher Not Cleaning

DWHD64CP/38

The part(s) or condition(s) listed below for the symptom Dishwasher not cleaning are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Dishwasher not cleaning

Cause 1Water Inlet Valve

The water inlet valve opens to allow water to enter the dishwasher. If the valve is clogged or defective, the dishwasher won’t get enough water to clean dishes properly. If the water inlet valve is clogged, replace it. Do not attempt to clean the water inlet valve—cleaning the valve could make it more likely to fail.

Part Testing
Parts
Water Inlet Valve for your ThermadorDishwasher
Water Inlet Valve - Part # 1105846 Mfg Part # 00425458

Dishwasher water inlet valve. If the dishwasher won't fill properly, then the water valve is likely restricted and will need replacement. If the dishwasher is underfilling, it won't clean dishes effectively.

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Cause 2Center Wash Arm Assembly

The center wash arm circulates water to the dishes in the upper rack. If water can’t flow properly through the center wash arm, the dishes in the upper rack won’t be cleaned properly. Over time, food particles can get trapped in the tiny holes in the wash arm. If your dishes are coming out dirty, the wash arm might be clogged. To unclog the center wash arm, remove the wash arm and dislodge any debris from the holes. If the wash arm is extremely clogged, replace it. In addition, make sure that the center wash arm assembly is mating properly with the water supply nozzle.

Parts
Center Wash Arm Assembly for your ThermadorDishwasher
Center Wash Arm Assembly - Part # 916349 Mfg Part # 00359976

Upper wash arm and tube assembly. *Snaps onto upper dishrack

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Cause 3Lower Wash Arm Assembly

The lower wash arm circulates water to the dishes in the lower rack. If water can’t flow properly through the lower wash arm, the dishes in the lower rack won’t be cleaned properly. Over time, food particles can get trapped in the tiny holes in the wash arm. If your dishes are coming out dirty, the wash arm might be clogged. To unclog the lower wash arm, remove the wash arm and dislodge any debris from the holes. If the wash arm is extremely clogged, replace it.

Parts
Lower Wash Arm Assembly for your ThermadorDishwasher
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Cause 4Circulation Pump

The circulation pump uses a motor and impeller to force water up through the wash arms. If the circulation pump is defective, the dishes won’t be cleaned properly. If the motor isn’t making any noise or is just making a humming sound after the dishwasher has filled, the motor may be burned out. First, ensure that power is getting to the motor. Second, to ensure that the impeller can turn, check the pump housing for debris. If power is getting to the motor and the pump is clear of debris, the motor might need to be replaced. Be aware that the circulation pump may be challenging to replace, although many do-it-yourselfers have been successful with the replacement.

Parts
Circulation Pump for your ThermadorDishwasher
Circulation Pump - Part # 1106293 Mfg Part # 00442548

Dishwasher circulation pump and motor assembly. If the dishwasher does not wash properly then the wash impeller could be worn or the motor could be defective.

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