Most Common Reasons a Bosch Induction Cooktop Won't Turn On

  • The cooktop has no usable electrical supply: A completely blank surface with no indicators is different from a powered panel rejecting input. Bosch manuals place branch power and installation connection first for a blank cooktop; a technician verifies the disconnect, supply, and terminal configuration.
  • Child lock is active: Bosch's current US induction support shows a lock indicator and a model-defined hold action on covered controls. A visible lock with an otherwise powered display calls for the exact E-Nr unlock procedure.
  • The touch surface is wet or covered: Bosch documents flashing displays when moisture or an object covers the panel. Clear and dry a cool panel; this is not a reason to open the cooktop.
  • Demo mode or a displayed fault blocks heating: A responsive display showing dE, U400, or another exact code is not a dead cooktop. Preserve the code and follow its E-Nr-specific meaning.
  • The control system is not initializing: Correct verified supply with a blank, unstable, or unusable panel requires service to separate input power, low-voltage supply, touch input, communication, and control operation.

Blank, Locked, Flashing, or Coded Are Different States

  • Blank: Begin with the supply/connection boundary.
  • Lock symbol: Use only the exact model's lock procedure.
  • All indicators flashing: Remove visible moisture or objects from a cool panel.
  • dE or another code: Preserve the characters and use Bosch's exact definition for the complete E-Nr.
  • Breaker opens: Leave power off and use the breaker-trip safety boundary.

Safe Checks That Change the Diagnosis

  • Photograph first: Capture the entire panel and complete E-Nr.
  • Clear the panel: On a cool appliance, remove cookware, objects, and visible moisture from the controls.
  • Use exact controls: Try only the E-Nr-specific power or unlock action.
  • Record scope: Note the exact visible state without trying to clear it first.
  • Stop after recurrence: Do not repeat breaker resets to make the display return.

What Not to Do

  • Do not open the cooktop, move a hardwired unit, or test live voltage.
  • Do not use random button combinations from another model.
  • Do not treat a lock, wet panel, demo mode, voltage code, and dead supply as one reset problem.
  • Do not replace a control board from a blank display alone.

Stop Using the Cooktop When

Leave power off for cracked glass, smoke, electrical odor, unusual cabinet heat, arcing, a repeat breaker trip, or unintended heating while controls do not respond.

What a Technician Must Confirm

Service verifies branch supply and connection, then checks low-voltage power, touch input, display/control communication, and fault history. A visible code is resolved by its Bosch definition before internal parts are considered.

What to Record Before Service

  • Model: Complete E-Nr, FD/serial, and panel photo.
  • Display state: Blank, lock, flashing indicators, dE, U400, or another code.
  • Timing: After outage, cleaning, installation, or during normal use.
  • Safety evidence: Trip, odor, heat, arcing, or cracked glass.

FAQ

Does dE mean the cooktop has no power?

No. A visible dE means the display and control have power; Bosch uses it for Demo mode on covered induction controls. A completely blank cooktop follows a different supply and connection diagnosis.