Answer first
The usual answer on this unit is loading that blocks the spray arms, with a filter and sump full of debris next. Both are about water not reaching the soil, and neither needs a part. Most of this you can rule out before the next load goes in.
What you are looking at
- Gritty residue over everything, including clean glasses — Debris is being recirculated rather than filtered out.
- Detergent still sitting in the dispenser at the end — The dispenser never opened, or nothing washed it out.
- NEAR MISS: there is standing water in the bottom at the end — That is a drainage fault and belongs on the drainage page for this unit.
Causes, most likely first on this unit
- Loading that blocks the spray arms — A tray laid flat, a handle hanging through the rack or a tall pot in the wrong place stops an arm turning. Everything behind the blockage comes out as it went in. First, and the whole order below follows from it: it is free to rule out, it changes with every load, and it explains the pattern where some items are clean and others are untouched.
- A filter and sump full of debris — The filter under the lower arm catches food soil so it is not sprayed back. Second on this unit, because it is a consumable maintenance job that is not mentioned at the point of sale, so most machines have never had it done.
- Detergent type, dose or age, and no rinse aid — Tablets that have absorbed damp, a dispenser loaded for a short cycle, or a machine run without rinse aid in hard water all give exactly this result with nothing broken. Third, once the two above are clean: it is the variable that changes weekly without anyone thinking of it as a change.
- A weak wash pump or a stuck diverter valve — The pump makes the pressure and the diverter shares it between the arms. Bottom of the list, deliberately: everything above it produces the same dirty dishes for nothing, and this one is the only parts job on the list.
The order to check in
- Spin both spray arms by hand with the racks loaded as usual — Anything that stops an arm is your fault, and you can see it in seconds.
- Twist out the filter under the lower spray arm and look at it — If it is packed, you have found both the grit and the poor cleaning.
- Check the detergent is fresh, correctly dosed, and that rinse aid is topped up — Cheapest test on the page: one load with fresh detergent answers it.
The checks you can make yourself
- Load the machine as you normally would, then turn each spray arm by hand through a full revolution — Anything that catches is the cause. Reload and run it again.
About 10 min
- Twist out the filter assembly, wash it under a hot tap with a brush, and clear the sump beneath it — Refit it and check it locks: a filter left loose lets debris straight into the pump.
Tools: a washing-up brushAbout 20 min
- STOP HERE if the next step needs a meter on live terminals — That is where an owner check ends and a service call begins.
Before you open anything
Safety
Kill the power at the breaker, or unplug the machine, before a panel comes off, and close the supply valve under the sink before you touch a hose. The element in the sump holds heat long after a cycle ends, so give it time before you reach in. Never run the machine with its kick plate off, and never wedge a door latch to make a cycle start.
Where an owner check ends
Call once the filter is clean, the arms turn freely and spray properly, the detergent is fresh and the water is arriving hot, because at that point the machine is not making pressure. Call sooner if you see water outside the machine or it trips a breaker.
Related pages for this unit
What this page does not cover
This page covers the Westbend dishwasher as a class, not one family or model line. Where a family- or model-specific page exists it is linked here. Deliberately not here: pump part numbers, diverter test procedures and any wiring detail, all of which differ by family and belong on the page for that family.
Links: - [A Westbend dryer that will not begin a cycle](/blog/westbend-dryer-wont-start) - [Why a Westbend washing machine will not drain](/blog/westbend-washer-drainage-failure) - [A Walsh dishwasher that runs a full cycle and cleans nothing](/blog/walsh-dishwasher-cleaning-performance)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
