What 6, 12, 20, 21 Means
These codes all report a water overflow error on the GTW chart, so they are documented together. These numeric codes come from the GTW-series GE top-load washer chart - the impeller and agitator top-loaders with a locking lid. They are read out of the control in a service mode, so the same number means something different on GE front-load machines. Overflow means more water entered than the control intended, and the practical risk is water on the laundry floor.
Common Causes of 6, 12, 20, 21
- Water inlet valve stuck open
- Pressure or water level sensor failure
- Blocked, split or disconnected pressure hose
- Control board not closing the valve
🔧 One Safe Check You Can Try
Close both taps at the hookup, then switch the washer off. Run a Drain & Spin if the machine accepts it so the basket empties. Do not keep restarting cycles to test it. Book service and leave the taps closed in the meantime - an inlet valve that does not close can overflow while nobody is watching.
⚠ Why You Shouldn't Go Further Than That
- An inlet valve that will not close is an active flooding risk that needs the supply isolated and the valve tested.
- The parts involved are under the top panel or in the base at line voltage, in a machine that may still hold water.
- Damage caused during a repair attempt may not be covered - check your warranty terms first.
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.