The short answer
A Black+Decker WQP dishwasher that will not start is usually being stopped rather than broken: a door that is not latching, a control lock or delay that is set, or a breaker that has gone. On these models the latch leads, because the machine is designed not to run with the door even slightly open and a latch out of alignment looks exactly like a dead machine. Start by deciding whether the panel lights at all. Settle the build before the ranking applies: these models divide on an air gap cap on the worktop.
What the owner actually sees
- The panel is completely dark — That is a power question — outlet, breaker or the supply to the machine — before it is anything else.
- Lights come on but pressing start does nothing — Look for an icon you do not recognise on the display.
- It beeps and clears the selection — Push the door firmly closed and try again.
- A cycle that begins and then quits — Note whether it had taken any water first.
- It runs but never takes any water — Supply valve, inlet or a float being held — the machine is running dry and will stop itself.
- NEAR MISS — it runs but leaves the dishes dirty — Nothing here applies once a cycle runs to the end.
Causes, ranked for the WQP build
- The door is not latching, or the latch is out of alignment — It leads because the interlock is absolute: the machine will not run with the door a millimetre open, and a latch that has drifted gives no clue on the panel. Look for wear on the hooks and for a strike plate that has moved.
- A control lock, child lock or delayed start is set — Second, and top of the list on any machine with small children in the house, because the lock is designed to be invisible in normal use.
- The water supply valve is closed or the inlet is blocked — Mid-list: it explains a machine that appears to start and then stops rather than one that never responds.
- Power: the outlet, the breaker or the spur that feeds it — A dishwasher is often on a shared kitchen circuit, so the breaker is worth reading rather than assuming.
- The thermal fuse, the door switch or the control board — Last, because it is the only cause here that needs a technician, and because the four above it explain most complaints.
The order that finds it fastest
- Decide first whether the machine has power — Dark sends you to the outlet and the breaker; lit sends you to the latch, the lock and the delay.
- Push the door firmly shut and press start again — Also check that nothing in the racks is holding the door out.
- Check for a control lock or a delayed start — Holding the lock key for a few seconds is the usual release, and a delay simply has to run out or be cancelled.
- Prove the supply with something else — A standard household branch circuit is 15 A or 20 A at 120 V and the kitchen is often shared, so read the panel rather than assume it.
- Make sure water can reach the machine — Turn it fully open rather than partly.
Power off first
Safety
Power off at the breaker before any panel is removed — unplug it where the plug is reachable, because a capacitor can hold a charge after the power is off. Never wedge or defeat the door latch to watch a cycle run.
When to call a technician
Call when the outlet is proved with another appliance and the panel is still dark, or when the latch and the locks are proved and the machine still refuses. That leaves the door switch, the thermal fuse and the control board, all of which sit behind a panel in a wet space. Call immediately if the machine trips the breaker when you restore it rather than simply staying dead.
Other faults covered for the WQP models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
