What C9 Means
C9 is a leak-detected alert tied to water pooling in the base pan, closely related to C1 but flagged through a different sensor path on some control platforms.
Common Causes of C9
- Failed door gasket
- Cracked or loose hose fitting
- Cracked tub or sump part
🔧 One Safe Check You Can Try
Turn off the water supply and don't run another cycle until a technician confirms there's no active leak.
⚠ Why You Shouldn't Go Further Than That
- The base pan isn't accessible without pulling the unit from its cabinet opening, and finding the exact leak source needs the unit run under observation.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.
Technical Reference
- Code
- C9
- Appliance
- Monogram dishwasher
- Maker documentation
- Monogram owner manuals and use & care guides
- Checked
- September 2026
Code meanings can change between control generations. Before acting on a code, match the full model number on your appliance's rating label against the manual for that model. We are an independent repair service, not affiliated with Haier US Appliance Solutions, Inc.