Bosch Dishwasher Error Code Er:05

Er:05 indicates an NTC thermistor circuit interruption, meaning the control board is detecting an open circuit where the water temperature sensor connects. This is caused by a break in the NTC cable or a failed NTC sensor. The dishwasher cannot monitor water temperature without a functioning sensor, so it stops the cycle and displays the fault code.

Resetting the dishwasher may temporarily clear the displayed code, but Er:05 will return as soon as the control board attempts to read the NTC sensor again. Because the fault reflects an actual open circuit in the wiring or sensor, the underlying hardware problem must be corrected before the error will stay cleared.

If the issue is simply a loose or disconnected connector, there may be no parts cost involved. Replacing the NTC thermistor sensor typically costs between $15 and $60 for the part depending on the specific model. If a technician is needed for diagnosis and repair, total service costs including labor generally range from $80 to $200.

In some cases yes. Start by inspecting the NTC cable and its connectors for disconnection or visible damage, as a loose connector can be reseated without replacing any parts. If the wiring appears intact, testing the NTC sensor with a multimeter requires basic electrical knowledge but is within reach for a confident DIYer. Replacing the sensor itself is a straightforward repair if the faulty component is identified.

Running the dishwasher with an active Er:05 fault is not recommended. Without a functioning temperature sensor, the control board cannot regulate wash water temperature properly, which could result in inadequate cleaning or uncontrolled heating. It is best to resolve the fault before resuming normal use.