These Dacor dishwasher check codes appear on the Samsung-era Modernist 24-inch dishwasher platform, documented in the “Information codes” section alongside LC, and each names a specific functional check rather than a single fixed hardware problem.
3C: pump operation check
3C covers the circulation and drain pump’s operation check, confirming the pump is actually running and moving water as expected during its assigned phase of the cycle. A pump that fails this check may be obstructed, wired incorrectly, or genuinely failed, and the code alone does not distinguish between those causes.
4C: water supply check
4C runs a water-supply check, most often surfacing when a supply valve is closed, the supply has been suspended, or the inlet line is frozen or clogged. This is documented as a Medium-severity problem, and in practice a meaningful share of 4C alerts trace back to something as simple as a valve that got bumped closed rather than a genuine inlet-valve failure.
5C: drain check via a detergent test cycle
5C is a drain check specifically run using a detergent test cycle, confirming the dishwasher can actually clear water from the tub within the expected time. A slow or partially blocked drain line, rather than a failed drain pump, is a common upstream cause worth checking before assuming a pump replacement is needed.
HC: high-temperature heating check
HC confirms the heating element can bring wash water to the expected temperature within the expected time. A persistent HC points toward the heating element or its control circuit, though a severely undersized or intermittent water supply — the same kind of issue that can trigger 4C — can also slow heating enough to trip this check indirectly.
Why these are called “checks” rather than plain problems
Each of these four codes corresponds to an actual functional test the dishwasher’s control system runs against a real subsystem — the pump, the supply line, the drain, or the heater — rather than a passive sensor threshold being crossed. That is a meaningfully different diagnostic model from a simple “sensor open” or “sensor shorted” code, and it means the dishwasher itself has already attempted to isolate which subsystem is behaving abnormally before ever displaying the code.
How these differ from the Legacy dishwasher’s codes
The Legacy EDW/IDW platform’s F-1 through F-9 codes describe conditions detected through the water-presence-sensor architecture rather than named functional checks, a genuinely different diagnostic approach on older hardware. Do not cross-reference the two systems when reading a code meaning.
When to book service
A 4C or 5C that persists after confirming the supply valve is open and the drain line is clear points toward a genuine valve, pump, or line problem worth an experienced technician’s diagnosis. Our dishwasher error codes page covers all four check codes alongside LC, and our dishwasher appliance page covers current models. Schedule a visit with the exact code noted, and see Dacor’s own site for current dishwasher specifications.
