The short answer
Water standing in a Blomberg dishwasher is most often the filter stack and the drain-pump chamber beneath it, both of which the owner can reach without tools. This platform puts a fine and a micro filter above the pump, so it traps debris that a coarser American machine would pass to a disposal. Check the filters before you suspect the pump.
What you are seeing
- Standing water covering the sump and filter at the end of the cycle
- The drain pump runs audibly but the level does not fall
- The machine drains slowly and finishes with a shallow pool
- The cycle stops early and shows a fault after the drain step
- Clean water reappears in the sump hours after the cycle ended
- A near-miss symptom: water under the machine rather than in it, which belongs on the leak page
- Body: Note how much water is left and when it stopped moving: Standing water covering the sump and filter at the end of the cycle. The drain pump runs audibly but the level does not fall. The machine drains slowly and finishes with a shallow pool. The cycle stops early and shows a fault after the drain step. Clean water reappears in the sump hours after the cycle ended. A near-miss symptom: water under the machine rather than in it, which belongs on the leak page.
Causes, most likely first
- A blocked filter stack — Why: the coarse, fine and micro filters sit in series over the sump, and a stack that has not been twisted out for months restricts the drain long before the pump is at fault.
- Debris in the drain-pump chamber — Why: glass chips, fruit stones and olive pits get past the coarse filter and jam the impeller, which is why the pump hums without moving water.
- A kinked or badly routed drain hose behind the machine — Why: a compact machine pushed back into a tight cabinet can trap its own hose against the wall, and this appears after any work near the machine.
- A blocked disposal or a missing high loop at the sink — Why: the discharge point matters more than the pump: a disposal full of waste or a hose without a high loop stops the machine draining and lets sink water back in.
- A blocked or stuck non-return valve — Why: the valve stops drained water returning, and when it sticks the tub refills quietly after the cycle ends.
- A failed drain pump — Why: it happens, but on this platform the four causes above account for most standing water, and a silent pump rather than a humming one is the sign that points here.
- Body: Ranked for a filter stack that sits directly over the pump: First, A blocked filter stack: the coarse, fine and micro filters sit in series over the sump, and a stack that has not been twisted out for months restricts the drain long before the pump is at fault. Second, Debris in the drain-pump chamber: glass chips, fruit stones and olive pits get past the coarse filter and jam the impeller, which is why the pump hums without moving water. Third, A kinked or badly routed drain hose behind the machine: a compact machine pushed back into a tight cabinet can trap its own hose against the wall, and this appears after any work near the machine. Fourth, A blocked disposal or a missing high loop at the sink: the discharge point matters more than the pump: a disposal full of waste or a hose without a high loop stops the machine draining and lets sink water back in. Fifth, A blocked or stuck non-return valve: the valve stops drained water returning, and when it sticks the tub refills quietly after the cycle ends. Sixth, A failed drain pump: it happens, but on this platform the four causes above account for most standing water, and a silent pump rather than a humming one is the sign that points here.
What to check, in order
- bail the standing water and twist out the whole filter stack, which is the most common restriction and needs no tools.
- look into the pump chamber under the filter with a light for glass, stones or a fruit pit.
- check the sink end: run the disposal, and confirm the drain hose rises into a high loop before it falls to the trap.
- listen during a drain: a humming pump means an obstruction at the impeller, a silent pump means power or control, and that is where owner checks end.
- Body: Work from the tub outwards, because that is both the likeliest and the easiest direction: First, bail the standing water and twist out the whole filter stack, which is the most common restriction and needs no tools. Second, look into the pump chamber under the filter with a light for glass, stones or a fruit pit. Third, check the sink end: run the disposal, and confirm the drain hose rises into a high loop before it falls to the trap. Fourth, listen during a drain: a humming pump means an obstruction at the impeller, a silent pump means power or control, and that is where owner checks end.
Checks you can do yourself
- Unplug the machine, bail the standing water with a cup and sponge the sump dry so you can see — Tools: cup, sponge, towel — Time estimate: a few minutes
- Twist the filter stack anticlockwise, lift it out, separate the parts and wash all of them under the tap — Tools: soft brush — Time estimate: a few minutes
- Shine a light into the pump chamber and remove any solid debris by hand, taking care with glass fragments — Tools: torch, gloves — Time estimate: a few minutes
- Run the garbage disposal if the machine discharges through one, then run hot water at the sink to clear the trap — Tools: none — Time estimate: a few minutes
- Refit the filter stack locked into place, then run a rinse programme and watch the level fall — Tools: none — Time estimate: half an hour or so
- Body: All of this is reachable through the tub floor: Unplug the machine, bail the standing water with a cup and sponge the sump dry so you can see (cup, sponge, towel; a few minutes). Twist the filter stack anticlockwise, lift it out, separate the parts and wash all of them under the tap (soft brush; a few minutes). Shine a light into the pump chamber and remove any solid debris by hand, taking care with glass fragments (torch, gloves; a few minutes). Run the garbage disposal if the machine discharges through one, then run hot water at the sink to clear the trap (none; a few minutes). Refit the filter stack locked into place, then run a rinse programme and watch the level fall (none; half an hour or so).
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. Broken glass in the pump chamber is the usual injury on this job, so wear gloves and use a light rather than feeling blind. Do not run the machine with the filter stack removed; the pump depends on it. unplug-before-service
When to stop and call a technician
These need the machine pulled out: The pump hums with a clean filter, a clear chamber and a clear sink drain. The pump is silent during the drain step. Water returns to the tub with the machine switched off, which points at the non-return valve or the hose route. The machine reports a drain fault immediately at the start of every cycle. The pump hums with a clean filter, a clear chamber and a clear sink drain The pump is silent during the drain step Water returns to the tub with the machine switched off, which points at the non-return valve or the hose route The machine reports a drain fault immediately at the start of every cycle
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: Does Not Clean or Dry
- Blomberg Dishwasher: Controls, Display or Error Code
- Blomberg Dishwasher: Cycle Will Not Run or Complete
- Blomberg Dishwasher: Door, Latch or Seal Fault
- 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.
