Monogram Dishwasher C1 Error: Water leak detected
The C1 error code indicates that the leak detection sensor inside the base of the dishwasher has detected moisture or standing water in the drip pan beneath the tub. The control board immediately halts operation to prevent water damage to surrounding cabinetry and flooring.
~50%
DIY Fixable
From $100
Typical Repair Cost
1–2 hrs
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Do not run the dishwasher while a C1 code is active. Continued use with an active leak risks water damage to cabinetry, flooring, and electrical components.
Can I reset the code?
No. Canceling power will clear the display, but the code will return immediately on the next fill cycle if the underlying leak source has not been found and repaired.
When to stop immediately?
Stop if you notice: Stop using the appliance immediately if water is visible on the floor or inside the cabinet beneath the unit., Stop and call a technician if the code reappears after the base pan has been fully dried out and the cycle restarted..
Symptoms You May Notice
Water pooling under the dishwasher
You may notice water seeping onto the kitchen floor from beneath the toe-kick panel, indicating moisture has reached the base drip tray.
C1 displayed on control panel
The dishwasher halts mid-cycle and the alphanumeric display shows the C1 fault code.
Dishwasher stops mid-cycle
The appliance ceases washing, draining, or heating abruptly without completing the selected cycle.
Drain pump runs continuously
In some cases the drain pump activates and runs non-stop in an attempt to evacuate any accumulated water from the base pan.
Possible Causes
Damaged or loose door gasket
A worn, cracked, or improperly seated door gasket allows water to escape the tub during the wash cycle and drip into the base pan.
DIY PossibleCracked spray arm or water inlet fitting
A cracked spray arm hub or a loose water inlet fitting can spray water directly onto internal components, eventually reaching the leak sensor.
Requires ProfessionalFaulty leak sensor or wiring
The float-style or conductive leak sensor in the base pan may be damaged, corroded, or triggering a false positive due to a wiring fault.
Requires ProfessionalSafe Checks You Can Do
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1
Inspect the door gasket
Open the door and run your fingers along the entire perimeter of the rubber door gasket. Look and feel for cracks, tears, or sections that have pulled away from the channel.
Pay special attention to the bottom corners where gaskets commonly split first.
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2
Check for visible water under the unit
Remove the lower toe-kick panel (usually held by two clips or screws). Shine a flashlight into the base and look for standing water or moisture on the drip tray.
Use dry paper towels to absorb any water in the tray before resetting the unit.
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3
Verify dishwasher is level
Use a bubble level on the interior bottom rack rail. An unlevel unit can cause water to migrate toward the front and trigger the sensor even without a true leak.
Adjust the front leveling legs clockwise to raise the unit and counter-clockwise to lower it.
Tools required
When to Call a Professional
Contact a qualified technician if:
- The leak source cannot be identified through visual inspection of the door gasket and spray arms.
- The base pan repeatedly fills with water after being dried, suggesting an internal hose or pump seal failure.
- The error persists on a dry base pan, indicating a faulty leak sensor that must be replaced.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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