Commercial Dishwasher Not Cleaning

• Clogged wash or rinse arms — Food debris and scale block the nozzles, so parts of each rack never get hit with full spray.
• Dirty scrap screens and pump intake — Screens packed with food starve the wash pump, and the weak spray that results leaves soil on plates and silverware.
• Wash tank too cool — A failed tank heater or thermostat, a water level too low for the heater to switch on, or hot water arriving too cool from the building keeps the wash below the temperature on the data plate, and grease stays on the dishes.
• Booster heater not keeping up — On a high-temperature machine the booster heats the final rinse, and a weak element or control leaves that rinse too cool to sanitize.
• Detergent, rinse aid or sanitizer not feeding — An empty container, a cracked pickup tube or a failed dispenser pump leaves a chemical out. Missing detergent leaves soil and film, missing rinse aid leaves spots, and missing sanitizer on a low-temperature machine sends out dishes that look clean but aren't sanitized.
• Worn wash pump or motor — A pump with a damaged impeller or a failing motor moves less water, and cleaning drops off across the whole rack.

• Cloudy film or spots on glassware — Hard-water scale, a rinse aid or detergent feed that has stopped, or a low final rinse temperature.
• Food left on one part of every rack — A clogged nozzle, or a wash arm that isn't turning freely.
• Plates coming out greasy — The wash tank isn't hot enough, or the wash water is overdue for a change.
• Rinse gauge below the data plate during the final rinse — On a high-temperature machine, the booster heater or its control can't bring the final rinse up to temperature.
• Weak spray noise during the wash — The wash pump, its motor or a blocked intake screen is cutting the water flow.

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