Bosch Dishwasher Error Code E:3100

E:3100 is a filling fault code indicating that the flood protection float switch in the appliance base has been activated. This typically means water has collected in the drip tray at the bottom of the dishwasher cabinet. The control board locks the appliance and prevents it from being switched off normally until the condition is resolved. If no water is present in the base, the fault may be caused by a wiring or switch issue.

A simple power reset will not permanently clear E:3100 if the underlying cause has not been addressed. The float switch remains triggered as long as water is in the base tray or a wiring fault is present, so the error will return. You must first remove any water from the base and resolve the source of the leak or the electrical fault before the appliance will operate normally.

Repair costs vary widely depending on the cause. If the fix involves only drying the base tray and cleaning a clogged drain or resetting a hose clamp, costs may be minimal. Replacing a door gasket typically runs in the range of $30 to $80 for parts. A new water inlet valve or pump can range from $50 to $200 or more in parts alone, with labor adding $100 to $250 depending on your area and service provider.

Start by pulling the dishwasher out and checking the base tray for standing water. If water is present, dry it out completely using towels or a wet-dry vacuum, then identify and repair the source of the leak before running the appliance again. If no water is found, inspect the float switch and its wiring harness for damage or loose connections. Depending on the root cause, repairs may involve replacing a door seal, hose, inlet valve, or the float switch itself.

No, you should not continue using the dishwasher while E:3100 is active. The error indicates a potential water leak inside the appliance, and running it could worsen the leak, cause water damage to your floor or cabinetry, or create an electrical hazard. The appliance is designed to lock out operation for this reason, so address the fault before running any cycles.