Bertazzoni Dishwasher: Will Not Drain
This page is written for the second occurrence: the fault was fixed and it has come back. A repeat is not the same diagnosis as a first failure — the part that was just replaced is the least likely suspect, and whatever caused it to fail is the most likely one. What changes the order on Bertazzoni is that the installation and the dealer service channel shape the answer as much as the component does.
What you are actually seeing
- Water covering the tub floor at the end of a cycle
- Dirty water that does not clear between stages
- A gurgling from the sink when the machine drains
- Water backing up into the sink
- A small amount of clean water in the sump — Means: That is normal; the sump is designed to stay wet so the seals do not dry out.
- Wet dishes with an empty tub — Means: That is a drying fault, not a drain fault.
- Heading secondary: Symptoms that mean a different fault
Most likely causes on a Bertazzoni Dishwasher, in order
- Drain hose kinked or without a high loop — Id: drain-hose — Why: Without a rise in the hose, water siphons back into the tub.
- House drain blocked — Id: house-drain — Why: Water leaves and comes back, and the sink usually shows it too.
- New disposal installed with its knock-out plug still in place — Id: disposal-plug — Why: A classic: the dishwasher drains into a disposal inlet that was never opened. It presents as a machine that has never drained since the kitchen work was done.
- Disposal full of waste — Id: disposal — Why: The dishwasher drains into it and cannot clear.
- Note: Bertazzoni is an Italian cooking-appliance house whose kitchens are specified as a suite and installed flush into millwork, sold and serviced through appliance dealers rather than big-box channels. This ranking is written for a repeat, not a first failure: whatever was replaced last time is the least likely suspect and whatever made it fail is the most likely one. On top of that, a flush-installed suite is leveled to the millwork and not to the floor, so alignment, clearance and installation faults outrank component wear on a machine this age.
What to check, and in what order
- Bail out the water and pull the filter and the sump cover — Why here: The filter is the first restriction and clearing it resolves the majority of these complaints.
- Run the disposal and then check for the knock-out plug if the kitchen has recently been worked on — Why here: A dishwasher that has never drained since a new disposal was fitted is this fault every time.
- Check the air gap on the sink top if there is one — Why here: It blocks quietly and is easy to open and clean.
Checks you can safely do yourself
- Bail the standing water out with a cup and a sponge until the tub floor is dry. — Tools: cup, sponge, bucket
About 20 min
- Remove the filter and the sump cover, clear debris, and check the impeller area for glass, seeds and labels. — Tools: soft brush, torch, gloves
About 30 min
- Run the disposal with cold water for thirty seconds, then check under the sink that the dishwasher inlet is open and the knock-out plug removed. — Tools: torch
About 20 min
- Clean the air gap on the sink top if fitted, and straighten the drain hose so it rises high under the counter before falling to the drain. — Tools: screwdriver, cloth
About 25 min
- Run a drain-only or a rinse cycle and watch whether the tub clears. — Tools: none
About 20 min
Before you open anything
Safety
Never defeat a door interlock or a safety switch to keep an appliance running, and stop at the first step that would put a meter on live terminals. Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off.
Where the owner fix ends
Call a technician when the filter and sump are clear, the disposal and air gap are proven, the hose has a high loop and the machine still holds water. That points at the drain pump, the check valve or the control.
Cleaning, seating, levelling and filter work are owner jobs. Anything requiring a board, an ignition module or the removal of a flush-fitted unit from millwork belongs with the dealer service network.
The same problem on other brands
What this page does not cover
This page is generalized across every Bertazzoni dishwasher family and model, and carries no model-specific error codes, variant matrix or service-part numbers. Cooking products are the core line; refrigeration, dishwashing and laundry are built on European platforms and carry those platforms’ service parts. A family- or model-specific page beneath this one takes precedence over anything written here. Common BERTAZZONI Dishwasher Problems — Slug: bertazzoni-dishwasher-problems — Relation: parent BERTAZZONI Dishwasher: Will Not Drain — Slug: bertazzoni-dishwasher-drainage-failure — Relation: variant
Other Bertazzoni dishwasher problems
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
