How to run diagnostics on Samsung dishwasher is done by entering diagnostic or test mode to check error codes and test components like water valve, circulation pump, and drain pump. For most Samsung dishwashers, method is press and hold Heavy and Delicate or Normal and Delicate buttons simultaneously for 3 seconds with door closed, then press Start to begin diagnostic cycle that runs through fill, wash, drain tests and displays error codes. Alternatively, press Power, then hold High Temp and Delay Start for 3 seconds. For models with digital display, error codes like 4C for water supply, 5C for drain, LC for leakage will appear. You can also use SmartThings app to run self diagnosis remotely that checks status. To exit diagnostic, press Power. For hard reset, turn off breaker for 5 minutes. Always consult user manual for your specific model number as button combinations vary. Running diagnostic helps identify faulty parts like not filling due to inlet valve or not draining due to clogged filter before calling technician.
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