The electricity reaching the range is outside the normal operating range. Bosch says to contact the electrical utility or Bosch support.
Model compatibility: Bosch reuses codes across series and model years, so U400 / E9000 / E9010 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
The supply voltage to the range is incorrect and falls outside its normal operating range.
Two entries on Bosch’s induction slide-in range page cover these codes: one for U400, one for E9000 and E9010. The wording is identical in both. The supply voltage is incorrect and outside the normal operating range, so the three numbers describe a single problem.
Why three numbers
Bosch gives no reason for a range to display U400 rather than an E-number. Since the description and the direction are the same for all three, one page handles them.
The cause lies outside the range
The message is about the electricity arriving at the range, not the range itself. Bosch publishes no reset. Its direction is to contact your electrical utility provider or Bosch Customer Support.
Safe things to do
See whether the breaker for the range has tripped, without taking off any panel cover.
Take note of lights dimming when the code shows, or of the problem coinciding with other appliances switching on.
Phone the utility and tell them what you noticed.
An electrician should do any voltage testing at the outlet or terminal block. Range circuits can seriously injure.
Questions
Does the range still work with U400 displayed? Bosch is silent on this. With the supply outside its normal range, holding off use until the reason is known is the cautious choice.
The utility reports nothing wrong. Bosch’s other option is Bosch Customer Support. An electrician can also inspect the circuit, and E9011, a wrong-connection code, is worth reading.
e310: the power supply code for freestanding ranges.
Induction range service in Los Angeles
Once the utility has examined the supply and the voltage code is still on the display, call (310) 879-1577 for Bosch range service in Los Angeles. Give us the exact number shown. The oven repair page has more detail.
Important safety warning. Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.
Seeing this code on your Bosch appliance?
Book a specialist visit for a clear estimate and approval before any repair.
