The answer before the explanation
A machine that hums and does nothing is not a no-start in the sense this page means: that is a jammed drum or a motor fault, and it belongs further down the diagnosis than the checks that come first here.
What owners of these models report
- The door will not latch firmly — A door that rests closed but does not latch keeps the lock from confirming, and nothing starts until it does.
- A padlock or key symbol is showing — Child lock is engaged. It is designed to be non-obvious and it stops every input until it is cleared.
- The machine beeps when start is pressed and then stops — An input was accepted and a check failed straight afterwards, which usually means a lock or a level condition.
- NEAR MISS - the cycle starts and stops within a minute — That is a stalled cycle rather than a no-start, and the cycle fault page for this family covers it.
- NEAR MISS - no start after a power cut — Many machines resume or clear their state oddly after an interruption. Switch off at the wall for a minute before diagnosing.
What it usually turns out to be
- Programme not actually started — On machines with a separate selection and start step it is common to leave a cycle selected and never started, especially after a power interruption.
- Water not arriving so the first gate never passes — The machine accepts the start, waits for its fill, and appears to be doing nothing at all. Closed taps are the usual reason.
- Door lock mechanism failed — Distinct from a door that is not latched: here the door closes correctly and the lock still does not report, and that is a part.
- Mains filter or interference suppressor failed — It presents as a completely dead machine with a live socket, which is why the socket test has to come first to make the finding meaningful.
What to check first, second, third
- Test the socket with a lamp or another appliance — It separates the dead-machine branch from the waiting-machine branch instantly, and it needs nothing you do not already own.
- Switch off at the wall for a minute and try again — Clears a control that has hung after a power interruption, and a machine that then runs has told you the fault was transient.
- Look for a child-lock or delay symbol on the display — Free, instant, and it explains an apparently dead machine that is in fact working perfectly.
- Re-select the programme and press start deliberately — Rules out the selected-but-never-started case, which is far more common than owners expect.
Power down first
Safety
Power off at the breaker before any access panel is lifted. Water on a kitchen floor beside a machine that is still plugged in is the hazard here, far more than anything inside the cabinet.
Models in the WGA family
Reference| Model number | Family key |
|---|---|
| WGA12400** | bosch:washer:wga |
| WGA12400UC | bosch:washer:wga |
| WGA14400UC | bosch:washer:wga |
The line between a fix and a call
Owner territory ends where the diagnosis needs a meter. If the checks in the order above leave you with a component that can only be tested electrically, that is the point to stop.
Nearest pages of this class
SC
Sarah Chen
Lead Appliance Repair Technician · 12 years experience
EPA 608 UniversalNASTeC Certified
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
