The short answer
Blomberg dishwashers are built on a European platform with a water softener and a salt reservoir inside the machine, so white film, chalky glassware and poor drying are usually a salt, rinse-aid or hardness-setting problem before they are anything mechanical. That single feature moves the ranking on this brand away from the spray-arm and filter causes that dominate most American machines. Start at the reservoirs.
What you are seeing
- A white chalky film on glasses and on the inside of the tub
- Glasses that look cloudy and stay cloudy when dry
- Gritty deposits on the underside of bowls and in cup recesses
- Dishes that come out clean but soaking wet, especially plastics
- Patches of dried food on items that faced away from the spray
- A near-miss symptom: dishes clean and dry but the tub smells, which belongs on the odour page
- Body: The kind of residue tells you which cause you have: A white chalky film on glasses and on the inside of the tub. Glasses that look cloudy and stay cloudy when dry. Gritty deposits on the underside of bowls and in cup recesses. Dishes that come out clean but soaking wet, especially plastics. Patches of dried food on items that faced away from the spray. A near-miss symptom: dishes clean and dry but the tub smells, which belongs on the odour page.
Causes, most likely first
- The salt reservoir is empty or has never been filled — Why: the built-in softener stops working without it, and untreated hard water leaves exactly the chalky film owners describe. On this platform it is the first thing to check, not the last.
- The hardness setting does not match the local water — Why: the machine doses softened water according to a value set at installation, and a value left at the factory default under hard water reproduces the film even with a full salt reservoir.
- Rinse aid empty or set too low — Why: this platform dries by condensation rather than with a heated element, so drying depends almost entirely on rinse aid breaking the water film. Empty rinse aid reads as a drying failure.
- Loading that blocks the spray path — Why: tall items in the lower basket shadow the upper arm, and a tray leaning over the arm stops it turning; this is the most common purely mechanical cause.
- A clogged filter stack or blocked spray-arm jets — Why: the coarse, fine and micro filters twist apart as a set, and a partly blocked stack recirculates soil back onto the load.
- All-in-one tablets used with a hard water supply — Why: combined tablets suppress the salt and rinse-aid indicators on some settings, so the machine stops warning you while the water stays hard.
- Body: Ranked for a machine with its own softener, which is what makes this brand different: First, The salt reservoir is empty or has never been filled: the built-in softener stops working without it, and untreated hard water leaves exactly the chalky film owners describe. On this platform it is the first thing to check, not the last. Second, The hardness setting does not match the local water: the machine doses softened water according to a value set at installation, and a value left at the factory default under hard water reproduces the film even with a full salt reservoir. Third, Rinse aid empty or set too low: this platform dries by condensation rather than with a heated element, so drying depends almost entirely on rinse aid breaking the water film. Empty rinse aid reads as a drying failure. Fourth, Loading that blocks the spray path: tall items in the lower basket shadow the upper arm, and a tray leaning over the arm stops it turning; this is the most common purely mechanical cause. Fifth, A clogged filter stack or blocked spray-arm jets: the coarse, fine and micro filters twist apart as a set, and a partly blocked stack recirculates soil back onto the load. Sixth, All-in-one tablets used with a hard water supply: combined tablets suppress the salt and rinse-aid indicators on some settings, so the machine stops warning you while the water stays hard.
What to check, in order
- open the salt cap in the tub floor and look: an empty reservoir explains film, cloudiness and poor drying at once.
- check the rinse-aid window and refill it, then raise the dosage a step if glasses still dry with spots.
- confirm the hardness setting against your local water, because the softener doses to that number and nothing else.
- only then look at loading, the filter stack and the arms, since those explain patchy cleaning rather than uniform film.
- Body: Check the consumables the machine actually meters, in the order it meters them: First, open the salt cap in the tub floor and look: an empty reservoir explains film, cloudiness and poor drying at once. Second, check the rinse-aid window and refill it, then raise the dosage a step if glasses still dry with spots. Third, confirm the hardness setting against your local water, because the softener doses to that number and nothing else. Fourth, only then look at loading, the filter stack and the arms, since those explain patchy cleaning rather than uniform film.
Checks you can do yourself
- Unscrew the cap in the tub floor and fill the salt reservoir with dishwasher salt only, never table salt or tablets — Tools: dishwasher salt, funnel — Time estimate: a few minutes
- Wipe up spilled salt and run a short rinse immediately so brine does not sit on the stainless tub — Tools: cloth — Time estimate: half an hour or so
- Fill the rinse-aid reservoir to the mark and raise its dose setting one step if drying has been poor — Tools: rinse aid — Time estimate: a few minutes
- Twist out the filter stack, separate the coarse and fine parts, rinse both and clear the micro screen with a soft brush — Tools: soft brush — Time estimate: a few minutes
- Lift each spray arm off its bearing, clear the jets with a cocktail stick, refit and check both turn freely by hand — Tools: cocktail stick — Time estimate: a few minutes
- Body: Work through the reservoirs first, the mechanics second: Unscrew the cap in the tub floor and fill the salt reservoir with dishwasher salt only, never table salt or tablets (dishwasher salt, funnel; a few minutes). Wipe up spilled salt and run a short rinse immediately so brine does not sit on the stainless tub (cloth; half an hour or so). Fill the rinse-aid reservoir to the mark and raise its dose setting one step if drying has been poor (rinse aid; a few minutes). Twist out the filter stack, separate the coarse and fine parts, rinse both and clear the micro screen with a soft brush (soft brush; a few minutes). Lift each spray arm off its bearing, clear the jets with a cocktail stick, refit and check both turn freely by hand (cocktail stick; a few minutes).
Safety first
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Dishwasher salt is brine when wet and corrodes stainless if left standing, so run a rinse after filling. Never mix a bleach product with a descaler in the tub, and let the machine cool before reaching into the sump. unplug-before-service
When to stop and call a technician
These are the results that are not a consumables problem: Film persists after the salt reservoir has been filled and a hardness value matched to your supply. The salt reservoir empties unusually fast, which suggests a cracked reservoir or a leaking cap seal. The upper arm does not turn even with the basket empty, which points at the feed tube. Wash results collapsed suddenly rather than degrading, which usually means the circulation pump. Film persists after the salt reservoir has been filled and a hardness value matched to your supply The salt reservoir empties unusually fast, which suggests a cracked reservoir or a leaking cap seal The upper arm does not turn even with the basket empty, which points at the feed tube Wash results collapsed suddenly rather than degrading, which usually means the circulation pump
Nearest pages of the same kind
What this page does not cover
This page is generalized across every dishwasher sold under the Blomberg name: it separates neither the freestanding and semi-integrated stainless machines from the fully integrated panel-ready ones and the compact widths from the full-size cabinets, and it names no individual model. Where a family- or model-specific page exists it is linked here and it outranks this one for that machine; at present no page beneath this one narrows to a single family, so treat the ranking above as the brand-level pattern rather than a reading of your serial plate. For the other faults that turn up on this machine, start from Common Blomberg Dishwasher Problems.
Related pages
- Common Blomberg Dishwasher Problems
- Blomberg Dishwasher: Abnormal Noise or Vibration
- Blomberg Dishwasher: Controls, Display or Error Code
- Blomberg Dishwasher: Cycle Will Not Run or Complete
- Blomberg Dishwasher: Door, Latch or Seal Fault
- Blomberg Dishwasher: Will Not Drain
- Blomberg Dishwasher: Electrical, Fire or Gas Hazard
- Blomberg Dishwasher: Not Heating
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
