The short answer
This page covers the Bosch SPV-series dishwasher on the level below the brand-generic article, so it starts where that one stops: with what the compact cabinet and a custom cabinet panel do to a poor wash. The brand answer is the filter, and it is not wrong; what changes here is everything after it, because the softener reservoir and top-edge controls decide which of the remaining causes is worth your next five minutes.
What you observe
- A chalky white haze on glassware — Minerals rather than soil, and on these models the water treatment is the thing to look at before the wash mechanics.
- Detergent still sitting in the dispenser at the end — The door never opened, or opened against something leaning on it.
- One rack clean and the other not — A spray pattern problem rather than a wash-quality problem, and the two are diagnosed differently.
- NEAR MISS - dishes come out clean but wet — Condensation drying working as designed. Rinse aid and a few minutes with the door ajar are the answer, and there is no fault here to chase.
Likeliest causes here
- A blocked filter in the tub floor — The filter is meant to be twisted out and rinsed by the owner, and a machine that has not had that done recirculates the same soil for a whole cycle. It leads here, and not by default: it is the one cause that gets worse every cycle it is ignored.
- The detergent dispenser blocked or opening late — A tall item leaning on the flap means the detergent lands at the wrong moment, or never leaves the cup at all. It sits second on this family because it is invisible unless you look at the cup at the end of a cycle.
- How the load was stacked, and the incoming water — Nested bowls and overlapping plates are exactly as unwashed as the spray pattern leaves them, and cold incoming water shortens the effective wash. Third here. The cause owners reach for first and the one that is right least often.
- Spray arm jets closed up, or an arm that cannot turn — Scale and debris shut the small holes, and a handle through the rack stops an arm dead where it stands. Last on this family, and deliberately so: usually obvious once the racks come out.
- Where this ranking departs from the brand-generic page — The cause that moves is a blocked filter in the tub floor. It leads on this family because the cabinet fills a narrower opening, so the sump, the filter and the clearance round the spray arms are all tighter. That is a property of the platform rather than of the brand, which is why the page above this one cannot rank it the same way.
Check in this order
- Twist the filter assembly out and rinse it under a tap — Look at what comes out of it. A filter that has never been cleaned is both the diagnosis and the repair.
- Run a cycle and open the door the moment it ends — Detergent still in the cup is a loading problem far more often than a mechanical one.
- Look at how the failed load was actually stacked — Nested bowls, overlapping plates and anything shadowing the dispenser explain more bad washes than any part does.
Before you open anything
Safety
Switch the machine off at its breaker before reaching under the tub - unplug the appliance or switch off its breaker before removing any panel, because a capacitor can hold a charge after the power is off. Assume broken glass anywhere near the filter, and let the sump cool before putting a hand in it after a hot cycle.
When to call
On these models the owner's ground is the filter, the arms, the dispenser, the rinse aid well and the rack arrangement, all of it reachable with the machine where it stands. Call once those are clean and the wash is still poor: what is left is wash pressure, the diverter and the heating circuit, and all three are diagnosed with the machine running and panels off.
Nearest pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
