The short answer
On a compact dishwasher a no-start is usually the door latch or the supply, not the control. Look for any sign of life on the panel first: lit means the machine is refusing, dark means you start at the breaker and the spur switch.
What you actually see and hear
- Panel lights up but the cycle never begins — The machine has power and is declining. Latch, lock or a delay setting.
- Completely dark with no lights or tones — Supply. The spur switch, the breaker or the plug behind the cabinet.
- It beeps or flashes when you press start — It is reporting a condition rather than failing - most often the door.
- It starts only if you push the door hard while pressing start — The latch, named by its own symptom.
- NEAR MISS - it starts and then stops part-way — That is a cycle fault, not a start fault, and it belongs elsewhere.
Causes, most likely first on this machine
- Door latch and its switch — First. The latch takes every open and close, it wears out of alignment on a light door, and the machine will not start without its signal however healthy everything else is.
- Supply at the spur or breaker — Second, and often invisible: a fitted machine is usually fed from a switched spur that somebody can knock off while cleaning.
- Control lock or delay start — Third, and free to rule out. Both are easy to set by accident on a flush panel.
- Water supply valve closed — Fourth. Some machines will not begin a cycle they cannot fill, so a closed isolating valve after plumbing work reads as a no-start.
- Control board, harness or a thermal device — Last. Real but least likely, and the only ones needing a meter.
Check in this order, and why
- Look at the panel for any light, tone or symbol — Lit means logic, dark means supply. This splits the list in half.
- Check the spur switch and the breaker — Behind or beside the cabinet, and the commonest invisible cause.
- Close the door deliberately hard and press start — If it runs, the latch is the fault and you have found it with no tools.
- Check the isolating valve under the sink is open — One turn, and it explains a machine that has not worked since plumbing was done.
What an owner can safely check
- Switch the spur off and on and press start again — Clears a control that has hung and proves the switch at the same time.
About 5 min
- Look for a lock symbol and hold the lock button to clear it — Control locks are set by accident more often than anyone admits.
About 5 min
- Check for a delay start counting down — A machine on delay looks inert and is working perfectly.
About 5 min
- Close the door with firm pressure while pressing start — Isolates a worn latch in seconds.
About 5 min
- Open the isolating valve under the sink fully — Especially if anything was done to the plumbing recently.
About 10 min
- STOP HERE before pulling the machine out to test the door switch or the board — That is live work in a wet cabinet.
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. A dishwasher sits in a wet cabinet with a live supply behind it, so switch off at the breaker before pulling it out, and turn the water off at the isolating valve under the sink before any hose is touched. Do not lean on an open door to reach the back of the cabinet.
When to call a technician
Call when the panel lights, the door latches firmly, no lock or delay is set, the water is on and the machine still will not begin a cycle - that leaves the door switch, the harness or the control. Call an electrician instead if the machine is dark and the spur and breaker are both on, because the fault is then in the supply rather than in the appliance. Call immediately if the breaker trips again when you reset it.
Nearest pages of this class
What this page does not cover
This page is written for the slimline built-in dishwasher class, not for one family or model line. Where a brand- or model-specific page exists for your unit it is the more specific answer and it is linked above, so go there first if your machine is named. What is deliberately not here: spray arm and pump part numbers, hose specifications, door spring tensions and control diagnostics, all of which differ by family and belong on the page for that family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
