Bosch Dishwasher Error Code E:9001

E:9001 is an undervoltage fault indicating the dishwasher is receiving a continuous power supply below 120V. The appliance monitors incoming line voltage as a protective measure and will terminate the wash program when voltage stays below the required threshold. This fault points to a problem with the home's electrical supply, not a defect in the dishwasher itself.

Resetting the dishwasher may clear the fault code temporarily, but if the underlying voltage problem is not corrected, the error will return as soon as the appliance detects low voltage again during the next cycle. Resolve the power supply issue first, then run a full cycle to confirm the fault does not reappear.

Because E:9001 is a power supply issue rather than an appliance fault, repair costs depend on what is causing the low voltage. If the fix is as simple as redistributing appliances across circuits, there may be no cost at all. Electrical repairs such as breaker replacement or wiring work typically range from $100 to $400 or more depending on the scope of the problem and local electrician rates.

Start by checking the outlet voltage with a multimeter to confirm whether supply voltage is actually below 120V. Inspect the circuit breaker and look for other high-draw appliances on the same circuit that may be causing voltage sag. If wiring or breaker issues are suspected, a licensed electrician should evaluate the branch circuit and panel connections.

The dishwasher has stopped the cycle as a protective measure, and you should not attempt to keep running it under low voltage conditions. Sustained undervoltage can cause motors and other components to overheat and draw excessive current. Address the electrical supply issue before running the appliance again.