The Bertazzoni dishwasher anti-flood pressure switch test is a periodic verification that the overflow protection system built into DW24PR and DW24XT models is ready to respond if an over-fill condition occurs. These Swedish-engineered appliances include a base tray sensor and pressure switch that should interrupt the water supply automatically — but only if the mechanism is functioning correctly.
Why this matters
The anti-flood system works by detecting water in the base collection tray beneath the wash tub. If the door seal fails, a hose connection loosens internally, or the pressure switch miscalibrates over time, the unit may either fail to stop filling during an overflow event or trigger false E4 or F2 flood codes that interrupt normal cycles. Either failure mode can result in water reaching your kitchen floor. Regular function verification ensures the protection layer Bertazzoni built into these machines is actually there when you need it.
Warning signs
- An E4 or F2 error code appearing on the display during or after a wash cycle
- Water visible in the base tray area when you tilt the dishwasher forward slightly for inspection
- The dishwasher draining immediately upon starting a cycle without completing any fill phase (a sign the flood sensor is triggering falsely)
- A musty or wet smell from beneath the unit between cycles
Inspection schedule
Verify the anti-flood system annually — or immediately whenever an E4 or F2 code appears. After any internal service that involves the door gasket, spray arms, or hose connections, confirm the base tray is dry and the float mechanism moves freely before resuming normal use.
What to do
- After the most recent completed cycle, carefully tilt the dishwasher forward a few degrees (have a helper stabilize it) to check whether water pools in the base tray. Any standing water is a sign the anti-flood sensor may have triggered — or should have.
- If the base tray is dry and you are seeing repeated E4/F2 codes, the pressure switch or wiring may be triggering falsely — do not reset and ignore; document the code and cycle at which it occurs.
- Inspect the door gasket around the full perimeter for cracks, compression set, or gaps that could allow water to exit the tub and reach the base tray.
- Confirm all internal hose connections visible at the back of the tub interior are firmly seated and show no mineral buildup or cracking.
- Call Bertazzoni North America at 1-866-905-0010 if base tray water is found or E4/F2 codes persist — do not continue operating a unit with active flood sensor activation.
When to call a technician
Any dishwasher that displays repeated E4 or F2 codes, contains standing water in its base tray, or shows signs of internal leakage requires service by a Bertazzoni-authorized technician before further use. The anti-flood system involves both electrical and plumbing components that interact with the main control board and should not be bypassed or reset without professional diagnosis.