What Leak Detected / 999 means (monogram dishwasher leak fault)
A monogram dishwasher leak fault condition — often shown as “999” or a leak-cancelled message — means the dishwasher’s leak-protection system found water in the base and cancelled the cycle to prevent a flood. It is a safety response — do not run the unit again until the water source is found.
Symptoms to look for
The signs below help confirm you are dealing with this condition rather than a different fault on your Monogram Dishwasher. You may see one of them or several together, and they can build up gradually or appear suddenly after a power event, a long door opening, or recent service.
- The display shows “999” or a leak-detected message
- The cycle cancels and the dishwasher drains
- Water is visible under or around the unit
Common causes
Several different faults can produce these symptoms. Working through the most likely causes in order helps separate a quick, owner-level fix from a problem that needs trained service and the correct Monogram parts.
- Real leak — water from a hose, the tub, or a connection reached the base
- Door seal leak — water escaped past the gasket
- Overfill or suds — excess water or the wrong detergent
- Leak sensor / base float tripped — by water or, rarely, a fault
Troubleshooting steps you can try
Work through these checks in order before calling for service. Stop wherever you are unsure, or where high-voltage parts, gas, the sealed refrigeration system, or the self-clean lock are involved, and hand the rest to a qualified technician.
- Stop the dishwasher and dry up any visible water under and around it.
- Confirm the correct dishwasher detergent and amount were used.
- Check the door seal and visible hose connections for drips.
- This is a leak-protection trip, so book service to find and fix the source before reuse.
Parts a technician may replace
Depending on what the diagnosis shows, a technician may inspect, test, or replace the leak sensor / base float, door seal, tub and hose connections, and drain pump. The correct part for your Monogram Dishwasher is matched from the model and serial number, and genuine Monogram components are fitted rather than generic substitutes so that performance, safety, and the appliance’s long working life are all protected. Confirming the failed part before ordering avoids replacing more than the fault actually requires.
When to call a technician
A leak-detected trip needs a technician to find the water source — a hose, seal, tub, or pump — and confirm the leak sensor reads correctly. When the fix calls for trained service, book a visit through our scheduling page and an experienced technician will diagnose and repair it. For factory documentation and model lookup, see the manufacturer at monogram.com.
Prevention and care
Regular care keeps this condition from returning on your Monogram Dishwasher. Keep vents, filters, and the condenser or ventilation path clean, avoid overloading or blocking airflow, check that doors and seals close cleanly, and follow the Monogram maintenance guidance for your model. Because this unit relies on electronic control, protect it with a stable, correctly rated power supply and have any built-in installation done to Monogram specification so the control never sees an out-of-range condition. If a code appears, note exactly what was shown before you reset the appliance — that record helps the technician reach an accurate diagnosis and avoid replacing parts unnecessarily. Where stored food, wine, or temperature-critical contents are at risk, or where gas or a safety lockout is involved, treat the condition as a reason to act quickly rather than wait.
Related help and Monogram resources
Browse other Monogram Dishwasher diagnostics, read about professional Monogram Dishwasher repair, look up your unit in the Monogram models reference, or the related C4 over-fill code, or schedule a service visit.
