--- title: "Dish Machine Not Draining: Dirty Water Left in the Tank: Causes and Fixes" description: "A dish machine not draining holds gray, greasy water in its tank at the end of a cycle or the shift, overflows onto the floor, or leaves a film on glassware…" url: "https://commercialappliancerepair.center/problems/dish-machine-not-draining/" --- # Dish Machine Not Draining: Dirty Water Left in the Tank A dish machine not draining holds gray, greasy water in its tank at the end of a cycle or the shift, overflows onto the floor, or leaves a film on glassware that should come out clear. ## What it usually means. A commercial dish machine washes with water that it keeps and reuses from rack to rack, so the tank has to empty at the end of the day, and on many models during the day too. Some machines drain by gravity through a valve or an overflow standpipe; others pump the water out. Food scraps are caught by scrap baskets and a strainer before they reach the drain. When the water stays behind, the causes run from easy to complex. Scrap baskets packed with napkins, lemon wedges and rice block the flow. An overflow tube or standpipe not seated after cleaning lets water bypass or holds it in. A drain hose behind the machine kinks when the machine is pushed back. From there, the drain valve or drain pump sticks, and grease and scale line the drain line until it barely passes water. Sometimes the machine is fine and the floor drain or grease trap it empties into is backing up; that is plumbing, and the visit says so clearly. Water standing overnight in a tank grows odors and coats the machine, so draining it matters beyond the inconvenience. The 6 causes, cheapest first Answer these first 01 Does the tank drain slowly, not at all, or drain and then fill back up? 02 When were the scrap baskets and the strainer last emptied and cleaned? 03 Is the overflow tube or standpipe seated firmly in place? 04 Does the floor drain the machine empties into take water, or is it standing full? 05 Can you hear a drain pump running at the end of the cycle? ## Check these before you book. Dish machine not draining: 5 checks, and none of them costs anything. 01 Switch the machine off and let the water cool before you touch the tank. 02 Lift out the scrap baskets and the strainer, empty them and rinse them in a sink. 03 Reseat the overflow tube or standpipe as the manual shows. ### Also worth checking - Look behind the machine for a kinked drain hose and at the floor drain for standing water. - Leave the drain pump, the valve and the wiring to the technician. ### How soon does it need a visit? A machine that drains slowly can wait for a booked visit within a couple of days if the baskets are kept clean. One that will not drain at all, or overflows onto the floor, is booked the same day and switched off meanwhile. ## The causes, cheapest first. 6 things dish machine not draining: dirty water left in the tank turns out to be, from scrap baskets full of napkins and food to floor drain or grease trap backing up. [The cost guide](https://commercialappliancerepair.center/cost/) 1. 01 no repair ### Scrap baskets full of napkins and food One shift can fill the baskets. Emptying them during service and at close, and scraping plates better before they are racked, keeps water moving. No repair: check it yourself 2. 02 no repair ### Overflow tube not seated after cleaning A standpipe set back at an angle holds water in or lets it bypass. Reseating it the way the manual shows usually clears the problem at once. No repair: check it yourself 3. 03 lowest ### Drain hose kinked behind the machine Pushing the machine back after cleaning can fold its drain hose. The hose is rerouted, secured and replaced if it has cracked. [Fixed by dish machine repair](https://commercialappliancerepair.center/services/dish-machine-repair/) [On a commercial dish machine](https://commercialappliancerepair.center/types/commercial-dish-machine-repair/) 4. 04 low ### Drain line lined with grease and scale Years of fat and minerals narrow the drain until the tank empties at a trickle. The line is cleared from the machine to the floor drain. [Fixed by dish machine repair](https://commercialappliancerepair.center/services/dish-machine-repair/) [On a commercial dish machine](https://commercialappliancerepair.center/types/commercial-dish-machine-repair/) 5. 05 low to moderate ### Drain valve or drain pump stuck A valve jammed by debris or a pump with a failed motor leaves the tank full. It is cleared or replaced with the machine powered off at its breaker. [Fixed by dish machine repair](https://commercialappliancerepair.center/services/dish-machine-repair/) [On a commercial dish machine](https://commercialappliancerepair.center/types/commercial-dish-machine-repair/) 6. 06 varies ### Floor drain or grease trap backing up The machine drains, but the water has nowhere to go. The visit confirms the machine side is clear and gives you a note for the plumber. [Fixed by dish machine repair](https://commercialappliancerepair.center/services/dish-machine-repair/) [On a commercial dish machine](https://commercialappliancerepair.center/types/commercial-dish-machine-repair/) ## What else it could be. Most often confused with water on the commercial kitchen floor near equipment and outlets, then dish machine not reaching temperature on the wash or final rinse. [All problems](https://commercialappliancerepair.center/problems/) Codes that come with it - [`019` Hobart · Water, fill and drain](https://commercialappliancerepair.center/error-codes/hobart-019/) - [`021` Hobart · Water, fill and drain](https://commercialappliancerepair.center/error-codes/hobart-021/) - [`035` Hobart · Water, fill and drain](https://commercialappliancerepair.center/error-codes/hobart-035/) - [`057` Hobart · Mode, not a failure](https://commercialappliancerepair.center/error-codes/hobart-057/) - [`Drain` Miele Professional · Water, fill and drain](https://commercialappliancerepair.center/error-codes/miele-professional-drain/) Also related - [**Combi Oven Steam Problem: Weak Steam, Scale or a Dry Cavity** 6 causes](https://commercialappliancerepair.center/problems/combi-oven-steam-problem/) Gas, fire, food at risk or water near power ### Water on the Commercial Kitchen Floor Near Equipment and Outlets 6 causes ### Dish Machine Not Reaching Temperature on the Wash or Final Rinse 6 causes ### Commercial Appliance Error Code on a Combi, Fryer, Dish Machine or Laundry Display 8 causes ## The makes it happens on. 35 makes on this site; dish machine not draining: dirty water left in the tank can show up on any of them. 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At least at every shift change and at close, and during a rush whenever water starts to look cloudy. Busy kitchens empty them hourly. ### The tank drains, but slowly. Is that urgent? Not immediately, but it usually gets worse. Clean the baskets and check the hose, and book if it stays slow. ### Can we pour drain cleaner into the dish machine? No. It can damage seals and pumps and mix badly with the chemicals the machine uses. The drain is cleared mechanically on a visit. ### Who handles a grease trap that backs up into the kitchen? A plumber or grease trap service. The technician confirms whether the machine itself is draining and tells you which side the problem is on. --- **[Read on the site: Dish Machine Not Draining: Dirty Water Left in the Tank: Causes and Fixes](https://commercialappliancerepair.center/problems/dish-machine-not-draining/)** **[Book a visit with CommercialApplianceRepair.center](https://commercialappliancerepair.center/schedule/)**