Bosch Dishwasher Error Code F70

F70 indicates a float switch fault in which the changeover contact of float switch B8/3 is closed, causing the drain pump to run continuously. This switch is located in the drip pan beneath the dishwasher tub and is designed to detect water accumulation from an internal leak. The code can be triggered by an actual leak, by debris under the float, or by a warped drip pan holding the float in the triggered position. The drain pump will continue to operate until the fault condition is resolved.

A simple power reset will not permanently clear F70 if the underlying fault condition still exists. As long as the float switch B8/3 contact remains closed, the error will return after power is restored. The physical cause, whether it is water in the drip pan, debris under the float, or a mechanical or electrical fault with the switch, must be resolved before the code will clear and stay clear.

Repair costs vary depending on the root cause. If the fix only requires clearing debris from beneath the float, there is no parts cost and only your time is involved. Replacing the float switch B8/3 or the drip pan typically involves parts costs ranging from roughly $20 to $80 depending on the specific component, plus labor if a technician is hired. If an internal leak has damaged additional components such as a hose or pump seal, total repair costs can range from $100 to $300 or more.

Some causes of F70 are straightforward to address without professional help. Disconnecting power, removing water from the drip pan, and clearing debris from beneath the Styrofoam float are tasks most homeowners or experienced DIYers can perform. However, if the fault is caused by an active leak, a warped drip pan, or a failed float switch B8/3, replacement parts and more involved disassembly may be required, which is better handled by a technician.

It is not recommended to continue running the dishwasher while F70 is active. The code can indicate an active internal water leak, which poses a risk of further water damage to the unit or the surrounding area. Additionally, the drain pump running continuously without being properly cycled can lead to accelerated wear on the pump motor. Disconnect the appliance from power and investigate the cause before resuming use.