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A dishwasher that washes badly is usually being starved of something rather than broken: water, heat, detergent contact or spray coverage. The order below is the order in which those four go wrong. On a Fagor dishwasher the place to start is the filter and the sump, because an integrated machine will not proceed until its own sensing says it may, so the control and sensing chain outranks the pump.
What you are looking at
- Detergent still sitting in the dispenser at the end — The dispenser never opened, or an item in the rack blocked it from opening.
- Grit left on the underside of bowls and plates — Spray is not reaching the lower rack, or the filter is returning debris into the wash.
- A chalky white film on glasses — A hardness or rinse-aid problem rather than a mechanical one, and it looks nothing like grit.
- NEAR MISS: dishes are clean but soaking wet — That is a drying complaint, not a washing one, and it has its own causes.
What it usually is, in order of likelihood
- A loaded filter recirculating its own debris — The filter bowl catches what comes off the dishes, and once it is full the pump draws through the debris and puts it back on the load. Ranked first on a Fagor dishwasher: these machines meter their own supply and will not proceed on a fill they consider short, so the supply side explains the symptom more often than the machine does.
- Blocked spray-arm jets or an arm that will not turn — Each jet is a small hole and each one silts up with hard-water scale and food debris. Where it sits here: ranks higher wherever the water is hard, because scale closes those jets from the inside out.
- Not enough water, or not hot enough water — Detergent needs heat to work and coverage to reach. Where it sits here: ranks near the machine-side causes because proving it takes more than looking, but it explains the stubborn cases.
- The wrong detergent, the wrong dose or no rinse aid — Old detergent loses its enzymes, a tablet in the wrong compartment dissolves at the wrong time, and a machine running hard water with no rinse aid leaves a film on everything even when the wash itself was fine Where it sits here: worth ruling out early on a machine that has always washed badly, as opposed to one that has got worse.
The order to work in
- Start at the filter and the sump — It is the cause that ranks first on this kind of machine, so it is the check that ends the diagnosis most often and the one that costs least to make.
- Pull the filter out and look at it — Thirty seconds, no tools, and it settles the most common cause outright.
- Spin both spray arms by hand — They should turn freely through a full circle with nothing catching.
Owner-side checks, step by step
- Run a hot empty cycle with a cleaner — A dishwasher cleaner or plain white vinegar in the dispenser, hottest cycle, no load.
Tools: dishwasher cleanerAbout 90 min
- Remove and wash the filter assembly — Twist it out, rinse it under a hot tap with a soft brush, and clear the sump under it by hand.
Tools: soft brushAbout 15 min
- STOP HERE if the water never gets hot — Testing a heating element or a thermostat means a meter on a live or dismantled circuit, and that is where the owner checks end.
Safety first
Safety
Switch the machine off at the wall or its breaker before reaching into the sump; a capacitor can hold a charge after the power is off, and there is a chopper or an impeller down there on many machines. Never mix a dishwasher cleaner with bleach, and never put washing-up liquid in the dispenser: the foam it makes will push water out of the door seal and onto the floor.
When this becomes a service call
Call once the filter, the arms and the loading are all proven good and the wash is still poor, or when the water is not getting hot on a cycle that should be hot. A circulation pump that is running weakly sounds normal and washes badly, and it is the one cause on this list that needs a technician to name with any confidence.
The nearest pages to this one
The limits of this page
This page covers Fagor dishwashers as a class, not one family or model line. Where a family- or model-specific page exists for your unit, that is the more specific answer and the one to read first. Deliberately not here: spray-arm part numbers, element ratings and detergent dosing tables, all of which differ by family.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
