The short answer
On the Cove DW dishwasher family the useful split is between a machine that is dark and a machine that is lit but silent. Dark is a circuit or a line-fuse question; lit but silent is the door latch, the control lock or a delayed start that nobody set on purpose — and on this family the second group is the larger one by a wide margin.
What you see on the DW family
- The panel lights but nothing happens when you press start — The board has power and has taken the press.
- The door closes but does not feel like it latches — On these models you should feel the strike pull in and hear it seat.
- A start light blinks and then goes out — A blink-then-quit is the board starting a cycle and losing a permissive straight away — usually the latch switch opening again as the door relaxes.
- The machine is completely dark — No panel at all means the question is the outlet, the breaker and the junction box under the sink, in that order.
Causes, most likely first on the DW family
- Control lock or delayed start left engaged — Ranked first on the DW family — it costs nothing to check and it is the single most common non-fault behind this complaint. A held button sets the lock on most panels, and a bumped pad can set a delay. The machine then sits doing nothing for hours and looks dead.
- No power at the outlet, the breaker or the junction box — Second — it explains a dark panel completely and a lit panel not at all, so the panel state sorts it in seconds. A dishwasher is usually hard-wired or plugged into a switched outlet under the sink, and the connection lives in a damp cabinet.
- Door latch and its interlock switch — Third — and still the most common single part to replace on a dishwasher that will not start. The latch assembly carries a microswitch the control has to see closed.
- Thermal fuse or main control board — Fourth — and deliberately so: it is the least common cause and the only one that is not a homeowner check. A thermal fuse on the board opens after a heat event and kills the machine outright.
- Body: The order below follows the shared parts rather than the differences — the stems in the DW family carry the same running gear and diverge at the cabinet — which is why the top of this list is not where the brand-generic article puts it.
Check in this order, and why
- 1. Look at the panel before you touch anything — Lit or dark decides the entire rest of the sequence, and it costs nothing.
- 2. Prove the supply at the under-sink connection — Only once the panel is known dark. This is where a dishwasher loses power and it is the one electrical check that does not need the machine pulled out.
- 3. Clear the control lock and any delayed start — Hold the lock pad until the icon clears, then cancel and drain.
- Body: The stems in the DW family share their layout, so the order below holds across the table; where a stem differs it differs at the cabinet, not at the part you are reaching for.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. The supply connection for a dishwasher sits in the cabinet under the sink alongside the water lines, so treat everything in that cabinet as live until the breaker is off and stays off.
Models in the DW family
Reference| Model number | Family key |
|---|---|
| DW2450 | cove:dishwasher:dw |
| DW2450WS | cove:dishwasher:dw |
| DW2451 | cove:dishwasher:dw |
| DW2451/ADA | cove:dishwasher:dw |
| DW2451/WS | cove:dishwasher:dw |
| DW2451ADA | cove:dishwasher:dw |
| DW2451ADA/WS | cove:dishwasher:dw |
When to call a technician
The line on the Cove DW dishwasher family is the lower access panel. Everything above it — the lock state, the latch feel, the supply under the sink — is an owner check. Anything behind it means dropping the toe kick with the machine isolated, and a machine that trips its breaker when you restore power should not be retried a second time.
Other DW dishwasher pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
