Quick symptom overview
Samsung DW80 / DW80R / DW80N / Chef Collection built-ins post 5C or 5E when the tub does not empty in the drain window. Two parts share the same outlet: the drain pump (small 120 VAC motor + impeller, not the wash motor) and a check ball or rubber flapper in the pump housing.
Pump failed: impeller locked on glass/seed, winding open, no 120 VAC. Check stuck closed: motor runs, impeller free, almost no flow at the hose barb. Check stuck open: tub empties, then dirty sink water returns. Treasure Coast grease and scale glue that ball shut more often than they burn a winding.
Same fork on GE Profile FTD: check valve vs drain pump. Generic light-flash drain notes: dishwasher not draining, flashing lights. Do not treat 5C like a washer fill code.
Safety: Open the dishwasher breaker before filters, the sump cover, or the lower access panel. Glass in the chopper/sump cuts. Do not chemical-snake the tub. Wet pump connectors: stop.
Step-by-step diagnostic hierarchy
-
Capture 5C / 5E and residual depth — Photograph the display. Measure standing water at the fine filter. Run Cancel/Drain once: hum + no drop, silence, or drain then refill from the hose.
-
Prove the house drain — Run the disposal and the sink. Slow shared drain is not a 5C pump. Confirm the disposal dishwasher knockout is out.
-
Fine and coarse filters — Twist out the cylinder and the coarse plate. Labels, glass, and Florida sand pack the sump cover and starve the drain impeller.
-
Air gap / high loop — Countertop air-gap cap (if equipped) or hose peak above the sink rim. A pinched hose behind a DW80 is still the cheapest 5C.
-
Drain impeller vs wash impeller — Power off. The drain impeller is the small one at the pump outlet, not the wash chopper in the sump center. Locked drain impeller = mechanical pump. Free = ohms and the check.
-
Check ball at the pump outlet — Disconnect the drain hose at the pump (towels). Look into the barb: the ball/flapper should open downstream with light air and seat closed the other way. Grease-welded shut = 5C with a good motor. Missing ball = backflow.
-
Electrical prove-out — Drain-pump winding ohms, then 120 VAC during Cancel/Drain with the door latched. Main board last.
Multimeter and safety checks
Power off, drain-pump connector isolated, unless the row says live.
| Test | Setup | Typical result | Fail |
|---|---|---|---|
| Line voltage | Junction box or receptacle | 108–132 VAC | Fix supply first |
| Drain pump winding | Isolated drain-pump pins (not wash motor) | 15–40 Ω (use the tech sheet; many DW80 drain pumps sit ~18–30 Ω) | ∞ Ω open motor; ~0 Ω shorted |
| Pump to core | Pin to laminated housing | ∞ Ω | Continuity = shorted pump |
| Drain impeller | Hand, power off | Free, slight magnet cog | Locked: glass/seed; clear or replace pump |
| Check ball / flapper | Hose off pump outlet | Opens to drain, seats against backflow | Stuck closed: 5C, motor good. Stuck open: water returns |
| Drain command | Live, Cancel/Drain, door latched | 120 VAC at drain pump for the drain window | No voltage: latch/control. Voltage + no flow + free impeller: check or hose |
| Door latch | Ohms, latch closed vs open | Changes state | Open latch = silent pump |
Do not jumper 120 VAC to the drain pump on the floor with the hose off unless you control splash. Do not run the wash motor as a “drain test.”
Root cause vs repair
| Finding | Fault | Action |
|---|---|---|
| Filters packed, pump unused | Soil, not 5C hardware | Clean; retest Cancel/Drain |
| Knockout still in disposal | Install error | Remove plug; clamp hose |
| Drain impeller locked or winding open | Drain pump | Replace drain pump; inspect check in the old housing |
| 15–40 Ω, 120 VAC, free impeller, no flow | Check ball/flapper closed | Clean/replace check or the pump assembly if the ball is integral |
| Drains then water returns | Check open or no high loop | Reseat ball; raise loop / service air gap |
| No 120 VAC, latch good | Control / harness | Repair harness then board |
| LE / water in base | Leak path | Not 5C—dry the base and find the leak before a new pump |
On many DW80 platforms the check ball lives inside the drain-pump housing. If the ball is not sold separately, replace the drain pump rather than leaving a scaled check on a new motor.
FAQ
What does 5C or 5E mean on a Samsung dishwasher?
Drain timeout. Filter, check ball, drain pump, hose, or shared sink line—not automatically a new UI.
How do I tell a stuck check ball from a bad drain pump?
Good ohms, free impeller, 120 VAC, no flow → check stuck closed. Open winding or locked impeller → pump. Water leaves then comes back → check stuck open or missing high loop.
What should the drain pump read?
About 15–40 Ω isolated. Open winding is a dead pump. Voltage without flow is the check or hose.
Should I pour drain cleaner into a 5C dishwasher?
No. It damages seals and will not free a check ball. Unplug and clean mechanically.
When to schedule professional service
Book service when 5C/5E remains after a clean filter, proven knockout, and free drain impeller; when windings are open; when the check will not seat; or when the base is wet at the pump. Schedule a dishwasher diagnostic →
FAQ · Family-owned Port St. Lucie
Frequently Asked Questions About Samsung Dishwasher 5C / 5E
What does 5C or 5E mean on a Samsung dishwasher?
Drain timeout. The control still saw water after the drain window. That is a packed filter, a jammed impeller, a stuck check ball/flapper in the pump housing, a kinked hose or disposal knockout, or no 120 VAC to the drain pump—not automatically a new main board. 5C and 5E are the same drain family on DW80-series displays; washer 4E/5E codes are a different appliance.
How do I tell a stuck check ball from a bad drain pump?
If the drain impeller turns freely, windings read about 15–40 Ω, and you measure 120 VAC during Cancel/Drain but almost no water leaves the barb, the outlet check ball or flapper is stuck shut. Locked impeller or ∞ Ω winding is the pump. Water leaves then floods back: check stuck open or missing high loop.
What should the Samsung drain pump read on a meter?
Unplug, isolate the drain-pump connector (not the wash motor). Many US 120 VAC Samsung drain pumps read about 15–40 Ω. ∞ Ω is an open motor. ~0 Ω is shorted. 120 VAC at the pump with a free impeller and no flow is the check, hose, or air gap—not a new winding.
Should I pour drain cleaner into a 5C dishwasher?
No. Caustic cleaner wrecks sump seals and will not free a plastic check ball. Unplug, pull the filters, then open the pump housing and clean the check mechanically.