---
title: "Wolf induction range error code U400"
description: "Wolf induction range error code U400: wolf error code U400: the appliance is measuring its own electricity supply and does not like what it sees, on an…"
url: "https://wolfmiami.support/error-codes/error-code-u400-induction-range/"
date_modified: "2026-08-20"
Product line: "Induction range legacy"
---


# Wolf induction range error code U400

### What this one means

The appliance is measuring its own electricity supply and does not like what it sees, on an induction range, where the cooktop is a power electronics assembly and the oven below it is conventional. It is a code the manufacturer publishes for this appliance, not one we have worked out — and it is decoded here rather than left as three characters on a display.

### What the code covers

A published cause names a circuit rather than a component, which is the single most useful thing to know before ordering a part. This one covers:

- A supply running high or low at the panel
- A neutral broken somewhere in the house wiring rather than in the appliance
- The two legs of a 240-volt feed not being two separate legs
- Over voltage

### Worth doing before you call

- Check whether the oven still heats with the cooktop off, and the other way round
- Check whether anything else in the house has misbehaved at the same time
- Look at the breaker for this appliance and reset it once

### Then what

This is one of the few codes that is usually about the house and not the machine. An electrician measures the supply; we measure what the appliance did with it.

This code is published for ranges. The [full list of codes](https://wolfmiami.support/error-codes/) has the rest of them, searchable, including the labels older and newer machines use for the same conditions.

What this code means

What this one means

The appliance is measuring its own electricity supply and does not like what it sees, on an induction range, where the cooktop is a power electronics assembly and the oven below it is conventional. It is a code the manufacturer publishes for this appliance, not one we have worked out — and it is decoded here rather than left as three characters on a display.

What the code covers

A published cause names a circuit rather than a component, which is the single most useful thing to know before ordering a part. This one covers:

A supply running high or low at the panel

A neutral broken somewhere in the house wiring rather than in the appliance

The two legs of a 240-volt feed not being two separate legs

Over voltage

Worth doing before you call

Check whether the oven still heats with the cooktop off, and the other way round

Check whether anything else in the house has misbehaved at the same time

Look at the breaker for this appliance and reset it once

Then what

This is one of the few codes that is usually about the house and not the machine. An electrician measures the supply; we measure what the appliance did with it.

This code is published for ranges. The full list of codes has the rest of them, searchable, including the labels older and newer machines use for the same conditions.

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**[Read full article: Wolf induction range error code U400](https://wolfmiami.support/error-codes/error-code-u400-induction-range/)**