Bertazzoni Induction Cooktop Code U400: Supply connection

What U400 means

On Bertazzoni induction cooktops, U400 points at the power connection. On the current TFT and hidden-slider models, such as the PE304TX, PE365TB, PE304TC, PE304HB and PE365HB, it means the 400V connection is incorrect and not suitable for the grill board. On the legacy P365IAE, it means the hob is not connected to the network, so the connection must be checked and reconnected.

Common causes of U400

Supply wiring installed in the wrong configuration
Loose or incorrect connection at the junction box
Missing phase or neutral at the supply
Link between terminals left out or placed wrongly

✓ One safe check you can try

1. Turn off all zones and switch the cooktop off at its breaker. 2. Do not open the cooktop or touch the wiring. 3. If the cooktop was installed or moved recently, tell the installer. 4. Switch the breaker on once and check whether U400 returns. 5. If it returns, leave it off and call us.

! Why to stop there

This code is about the supply connection, which is live wiring.
An incorrect connection can damage the board.
Fixing the connection takes a qualified person with proper tools.
We check the supply, quote in writing first and cover the work for 30 days.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Cooktop codes

Sudden Shutdown With Signal ToneBertazzoni Induction Cooktop Sudden Shutdown With a Signal Tone and Error Code Touch Controls UnresponsiveBertazzoni Induction Cooktop Touch Controls Unresponsive: Locked or Wet Keys UBertazzoni P304IAE Induction Cooktop Code U: No pan or inadequate pan u (pan symbol)Bertazzoni Professional Induction Cooktop Code u: No suitable cookware HBertazzoni Cooktop H on the Display: Residual Heat Indicator LBertazzoni Induction Cooktop Code L: Child lock activated FABertazzoni Cooktop Code FA: Security Key Error in the On/Off Key Emitter No pan symbolBertazzoni Induction Cooktop Message "No Pan Symbol": Pan removed from zone

U400U400 questions

What does U400 refer to?

It refers to the electrical supply connection. On current models the 400V connection is wrong for the board, and on the P365IAE the hob is not connected to the network.

Is U400 caused by a power outage?

Not usually. It is more often an installation or wiring issue. If it appeared right after a new install or a move, the connection should be checked first.

Can I fix U400 myself?

No. The wiring is under the cooktop and carries line voltage. Call us, and we will check the connection and give a written price before any work.