The short answer
A dishwasher that will not start splits cleanly in two: either the machine has no power and the panel is dead, or the panel lights up and the machine still refuses to go. The second is far commoner and it is usually a latch or a lock. Press any button. A response of any kind — a beep, a light, a display — means the machine has power, and the fault is in what it is waiting for. On a SPT dishwasher the cause that ranks first is door latch not making, or the latch switch worn.
What you observe
- A lock symbol or a clock symbol is showing on the display — The control is refusing input by design.
- The panel lights up but pressing start does nothing — Power is present; the machine is waiting on a permission it has not been given.
- NEAR MISS — the machine runs but the dishes come out dirty — That is a cleaning-performance fault and belongs on its own page.
Causes, most likely first on a SPT dishwasher
- Door latch not making, or the latch switch worn — The control will not energise anything until the latch tells it the door is shut, and a worn hook or a tired switch stops that signal without stopping the panel. It ranks first on a SPT dishwasher because these cabinets are built to a price, so the simple wear items go first and they go often.
- No power at the outlet, or a tripped breaker — The machine is wired to a socket under the sink or a switched spur that has been turned off, or the circuit has tripped and nobody looked. Second on this platform: a dead panel means the fault is upstream of the machine, and that is cheap to check.
- Control lock or delay start left engaged — A lock icon, a child lock or a delayed start swallows every press and gives no warning beyond a small symbol. Ranked here because it costs nothing to rule out and it is the cause that embarrasses people most often.
- Water supply valve closed, so the cycle aborts on fill — The machine starts, waits for water that never arrives, and cancels — which from the outside looks like it never started at all. Last, and the reason to work down the list rather than guess: it looks identical to a start fault, and it is the one cause that leaves the machine apparently dead mid-cycle.
Check in this order, and why
- Open and shut the door firmly and listen for the latch click — A soft or silent latch is the answer before anything else is tried.
- Check the panel is dead, then check the breaker and any switched spur — A dead panel and a live socket are two different faults.
- Look for a lock or clock symbol on the display and hold the marked button — Most machines clear a lock by holding one key for a few seconds.
What an owner can safely check
- Close the door with deliberate pressure and press start again — Clean the latch hook and the striker plate if the click is soft.
Tools: clothAbout 5 min
- Reset the breaker and confirm any switched spur or isolator under the sink is on — If the breaker trips again immediately, stop and call.
Tools: torchAbout 10 min
- STOP HERE — the next check means a meter, a panel, or both — The ranking above tells you what to ask for; it does not make the remaining tests owner work.
Before you open anything
Safety
Unplug the machine or switch off its breaker before removing any panel — a capacitor can hold a charge after the power is off. Never tape, wedge or otherwise defeat the door latch to make the machine run: it is an interlock and it is there to stop the machine filling with the door open.
When to call a technician
Call once the supply, the latch and the lock are all ruled out, and call straight away if the machine trips the breaker when you press start. On a countertop machine, get a price before committing — the labour on a small machine is the same as on a large one, and the machine is not.
Nearest pages of this class
What this page does not cover
This is the generalized page for a SPT dishwasher. It does not carry anything model-specific: no part numbers, no wiring colours, no panel sequence and no torque figures, because those differ between families sold under the same badge. Where a family- or model-level page exists it is linked above, and it is the more specific answer of the two.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
