Two systems that never cross over
A Legacy Dacor dishwasher, built on the EDW or IDW water-presence-sensor platform, answers with an F-1 through F-9 code straight from Dacor’s own service manual. A Samsung-era dishwasher, internally documented under the Samsung project name DW9500MD, drops the F-dash system entirely for a two-character letter code — LC, 4C, 5C, HC, 3C, or PC — and two of those, 4C and 5C, are exact string matches to Samsung’s own published dishwasher codes.
What the Legacy codes report
F-1 points at the inlet valve when the controller cannot detect water after a fill, F-4 points at the drain pump when water is still present after draining, F-6 flags the Aqua-Stop-style leak-detection system, and F-8 marks a communication break between the control board and the power board, often traced to a wet connector in the door-to-base harness.
What the Samsung-era codes report
LC signals a detected leak and calls for the water supply and breaker to be shut off, 4C means the water supply is closed or the inlet line is frozen or clogged, 5C is a drain check run during a detergent test cycle, HC flags the heating system, and AP is only an app-pairing prompt, not a fault.
When to call
An LC alert, or a 4C that persists after checking the supply line, deserves an experienced technician with the correct genuine OEM or trusted-supplier part for the exact generation. Visit the dishwasher error codes page or the error-codes library, then book dishwasher repair.