The answer, before the detail
On Big Chill BC models a dishwasher that has stopped cleaning is nearly always failing to get water where it needs to go, not failing to wash: blocked spray jets, a filter full of debris, or a load packed so the arms cannot turn. Which of those leads depends on whether your machine has a lift-out filter or a grinder. The first three checks below take a few minutes and no tools. Settle the build before the ranking applies: these models divide on an air gap cap on the worktop.
What you observe on these models
- Gritty deposits left on plates and in cups — It is often worse on the upturned items in the top rack.
- Glasses that come out dull rather than dirty — A water hardness and detergent reading rather than a mechanical one.
- The cup has opened but the tablet has not dissolved — Either the cup is blocked by a tall item or the water is not warm enough to dissolve it.
- One rack consistently worse than the other — Swap a few items between racks to confirm the pattern.
- The spray arms do not spin freely by hand — An arm that cannot turn cleans a stripe and misses everything else.
- NEAR MISS — dishes come out clean but wet — That is a drying and rinse-aid question rather than a wash fault, and a different page.
Most likely first on this family
- The water arriving is not hot enough — It climbs to the top where the machine is a long pipe run from the water heater, because the cycle fills with whatever is in the pipe at that moment.
- The filter or the sump is loaded with debris — Second on filter builds and effectively absent on grinder builds, which is why the first thing to establish is which one you have.
- Detergent type, dosing or a blocked dispenser — Mid-list, but it moves to the top when the complaint is film rather than grit, and in hard-water areas generally.
- The spray arms are blocked, clogged or held by the load — It is placed here because it costs little to rule out and rules out more than it costs.
- The wash pump, its impeller or the chopper — Last of the five, because everything above it is cheaper and far likelier, and because this is the only one that needs a technician.
The order that finds it fastest
- Check the arms turn freely and the jets are open — First, because it costs nothing and it explains most complaints on this class.
- Check the filter and sump for debris — On a filter build this is the maintenance nothing reminds you to do; on a grinder build there is nothing to lift.
- Run the kitchen tap hot before starting a cycle — This is the free test for the temperature cause.
- Look at what is left in the dispenser at the end — Make sure nothing tall is blocking the cup door when you load.
- Take loading out of the question — Nested bowls and overlapping plates shadow each other, and no machine cleans through another plate.
Power off first
Safety
Switch the machine off at its breaker before reaching behind the kick plate or the door panel — water and mains wiring share the same small space in a dishwasher, and a capacitor can hold a charge after the power is off. Leave the door latch and its switch exactly as they are: the machine is meant to stop the moment the door opens.
When to call a technician
Call when the arms spin freely with open jets, the filter is clean, the fill is hot and the detergent dissolves — and the dishes still come out dirty. That leaves the wash pump, the impeller or the chopper, and none of those are reachable without taking the machine out. Call sooner if the cycle sounds different from the way it used to, because a pump losing pressure usually changes its note.
Other faults covered for the BC models
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
