The short answer
A Costway FP Dishwasher that has quietly got worse over months is describing a filter and spray-arm problem, not a failed pump. Sudden total failure is a different page. On these models the arms and the filter come out by hand, which is why they lead the order here rather than sitting halfway down a generic list.
What you see on the FP family
- Gritty deposits left on the dishes after a full cycle — Food is being redistributed rather than drained. That points at the filter and the sump before anything else.
- A white film or cloudiness on glassware — Mineral film from hard water and under-dosed detergent, or rinse aid that has run out. It wipes off with vinegar, which is how you tell it from etching, which does not.
- The top rack is clean and the bottom is not, or the other way round — One arm is not turning or is blocked. Which rack fails tells you which arm to pull first on these models.
- Dishes are clean but soaking wet at the end — That is drying rather than washing: rinse aid, final rinse temperature, or plastics that were never going to dry in a condensing machine.
Causes, most likely first on the FP family
- Water temperature and fill volume at the machine — Ranked first on the FP family — where the machine sits far from the water heater this dominates everything else, and it costs nothing to test. A dishwasher that fills short or fills cold cannot dissolve detergent properly. Running the kitchen tap hot before starting a cycle is the standard way to stop the first fill arriving cold.
- Spray arms blocked or not rotating — Second — the arms lift out by hand and should spin with a flick. Fragments of label, seeds and bone chips block the jets, and a tall item in the rack can stop an arm outright. An arm that cannot sweep leaves a shadow that looks exactly like a weak pump.
- Filter and sump loaded with debris — Third — a blinded filter starves the arms, so it produces the same symptom from one step further back. A fine filter traps what the coarse one misses, and once it blinds over the pump recirculates dirty water at reduced pressure. It degrades over months, which is why owners rarely connect it to a date.
- Detergent, rinse aid and water hardness — Fourth — but the one to revisit if the mechanical checks all come back clean. Under-dosing in hard water leaves film; old detergent that has absorbed moisture will not dissolve at all; an empty rinse-aid reservoir shows up as wet dishes rather than dirty ones.
- Body: With only 3 codes in the FP family the ranking below is taken over a short roster rather than over everything the brand sells, which is why the top of this list is not where the brand-generic article puts it.
Check in this order, and why
- 1. Pull both spray arms and spin them by hand — They should turn freely with a flick and every jet should be clear. This is the check that most often ends the job on these models.
- 2. Run the kitchen tap hot, then start a cycle — It removes the cold-first-fill variable in one move, which is otherwise hard to separate from a detergent problem.
- 3. Lift out the filter stack and wash it — Under running water with a soft brush. If it was blinded, run one empty hot cycle before judging anything else.
- Body: The 3 codes in the FP family are close enough in layout that the order below holds across all of them; check the plate on your own unit against the table before you order anything.
Before you open anything
Safety
Cancel the cycle and let the tub cool before you put a hand in it: a final rinse leaves water and metal hot enough to scald. Work the filter and arms with the door open and the machine idle, and wear a glove if the sump has had glass in it. Switch the breaker off before removing the lower access panel for anything deeper.
Models in the FP family
Reference| Model number | Family key |
|---|---|
| FP10217 | costway:dishwasher:fp |
| FP10851 | costway:dishwasher:fp |
| FP10852 | costway:dishwasher:fp |
When to call a technician
On the Costway FP dishwasher family the owner line is everything reachable through the open door. Once the diagnosis moves behind the lower access panel — pump, diverter, heater or the wiring to them — it needs the machine isolated and pulled, and that is the point to hand it over.
Other FP dishwasher pages
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
