Commercial Dishwasher Sanitation Concern: Chemical Delivery Service in Mountain View
The customer reported that a health-department test strip did not pass and that sanitizer was not reaching the dishwasher. The chemical delivery system required replacement and adjustment. The service record identifies chemical tubing, squeeze tubes and hose clamps.
Repair at a glance
| City | Mountain View, CA |
|---|---|
| Appliance | Commercial dishwasher |
| Category | Commercial |
| Brand & model | American Dish Service ET-AF-3 commercial dishwasher |
| Repair date | |
| Customer complaint | The customer reported that a health-department test strip did not pass and that sanitizer was not reaching the dishwasher. |
| Diagnosis | The chemical delivery system required replacement and adjustment. The service record identifies chemical tubing, squeeze tubes and hose clamps. |
| Repair cost | $587 (parts and labor) |
| Warranty | 6 months on parts and labor |
| Outcome | Repaired |
Inspection and access
I opened the chemical-delivery area of the American Dish Service ET-AF-3. The complaint concerned chemical delivery and a reported failed sanitation test, while the customer said the rest of the dishwasher was working.
Repair and reassembly
I serviced the chemical-delivery system using the tubing, squeeze tubes and clamps listed in the work record. The photos show the three dosing-pump positions, chemical hoses and the exposed connections during access.
The final invoice was $587 rather than the initial $787 estimate. The photos include a test-strip container, but they do not establish a final health-department approval or a passing sanitizer concentration, so I have not claimed either here.
Photos from this repair
American Dish Service commercial dishwasher before service. 
Wash chamber during the service inspection. 
Chemical dosing-pump assembly opened for access. 
Chemical supply container and pickup connection. 
Rinse chemical supply at the service location. 
Chemical tubes and wiring during service. 
Open dosing assembly during tubing work. 
Test-strip container used during the inspection. 
Chemical delivery connections at the open dosing assembly. 
Chemical supply tubing at the dishwasher.
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