The short answer
A BS dishwasher that does nothing when you press start is usually a door-latch or power-supply problem rather than a failed control board. On this family the latch is the interlock the control listens to, so it comes before the board in the order, which is where this page departs from the brand-generic one.
What you observe
- The machine beeps and cancels immediately — A door that closes but does not latch square gives exactly this.
- Cycle starts then stops within a minute — A fill or level fault rather than a start fault, though it presents the same way to the owner.
- The panel lights then goes out on its own — A supply that is marginal or a control resetting, and it needs the circuit proven first.
- Buttons respond but the programme never begins — The control is alive and refusing, which is the latch or an active lock.
- NEAR MISS - it runs but nothing gets clean — That is a wash-flow fault and belongs on the cleaning page.
Causes, most likely first on BS
- Door latch or its switch not making — Ranked first on the BS family: a heavy professional door needs a firm push to seat, and a latch that has moved slightly will not close the circuit. What decides the order here is what has to move before you can see anything, and on this family that is fixed by the build. What moves against the brand-generic order is lower down: control lock, delay start or a demo mode left on sits above thermal or door-interlock protection tripped here, because this family is a single build with fixed access points.
- No power at the appliance — Second: these installations often have a switched spur, and the switch gets turned off during other work under the sink.
- Control lock, delay start or a demo mode left on — Third: the professional panels carry more modes, so a delay left set is a genuine candidate here.
- Thermal or door-interlock protection tripped — Fourth: these machines run long hot cycles, so a thermal device that has done its job is worth considering.
- Control board or user-interface failure — Last: last, and the only item here that is not owner work on a built-in machine.
Check in this order, and why
- Confirm the panel lights at all — This one observation splits the fault in two and saves everything that follows.
- Confirm the stop tap is open before blaming the control — A machine that cannot fill abandons the cycle in a way that reads as a refusal to start.
- Cut power at the breaker for a minute and retry — It clears a latched control state and costs nothing to do first.
- Rule out control lock and delay start — Hold the lock button for a few seconds and cancel any delay, then retry.
Before you open anything
Safety
Power off at the breaker, water off at the stop tap, and hands out of the sump until you have looked into it with a torch. Leave the latch to do its job and judge a running cycle from outside the machine.
When to call a technician
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. The latch, the breaker and the panel modes are owner checks. Call when the supply is confirmed live, the latch makes and the machine still will not run.
Other BS pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
