Gaggenau Induction Cooktop Not Heating? Causes

Why the pan decides whether it heats#

Induction makes heat in the pan itself, not in the glass, so it only works with ferromagnetic cookware. Aluminum, copper, glass, and non-magnetic stainless are invisible to the coil and never warm up. Gaggenau cooktops (models such as the CX482111, CI282111, CG492211, and VI422111) share BSH Group power electronics with Bosch and Thermador, and they show a "U" or pan icon when no compatible pan is detected. A quick magnet test settles it: if a magnet grips the base firmly, the pan will heat.

Causes at a glance#

Working through the causes#

Incompatible cookware (30%, not a malfunction). Before suspecting the cooktop, rule this out. A non-magnetic pan, or one too small for the zone (below about 12 cm on standard zones), or a warped base that won't sit flat on the glass, all read as "no pan" and trigger the "U" icon. Test with a magnet — cast iron and magnetic stainless grip firmly — and use a correctly sized, flat-bottomed pan centered on the zone.

IGBT power board failed (25%). The IGBT power board is the high-power switching electronics that energize the coil. When it fails, a zone goes completely dead — no heat and no boost — even with the right pan. On the shared BSH platform this is a common electronic failure, and it is tested and replaced as a power-electronics component, not a DIY part.

Pan or surface sensor error (20%). Each zone has sensors that watch pan presence and glass temperature. A faulty sensor can cut the zone and post an E-series code such as E1, E5, E6, or E9. Read the code on the panel first — it points directly at the sensor or the control fault rather than leaving you guessing at the coil.

Zone induction coil failed (15%). If one zone stays cold while the others work with the same pan, the induction coil for that zone may have failed or lost its connection. Isolating the dead zone from the working ones is the tell — a single cold zone points to that coil or its wiring rather than the shared power board.

User-interface control (10%). The touch control sends your commands to the power electronics. If the interface is unresponsive or misreads touches, a zone may never receive the command to heat even though the coil and board are fine. Confirm the panel responds cleanly before condemning anything downstream.

Troubleshoot safely#

Disconnect power at the breaker before any inspection — induction cooktops carry high-voltage power electronics. Find the model number on the serial plate for the correct proprietary parts, and note any error code the panel shows; on the BSH platform those codes narrow the cause significantly before the glass ever comes up.

When to call a professional#

Bring in a technician if the fault survives the pan and code checks, if you notice a burning smell, sparking, or electrical damage, or if the unit is under warranty. The IGBT board, coils, and sensors are high-voltage components best handled by someone experienced with BSH induction electronics specifically.

Repair or replace?#

Against the cost of a new Gaggenau cooktop, a board, coil, or sensor repair is usually well justified, so a unit in otherwise good condition is worth fixing once the code and pan test point to the real cause.

Induction zone gone cold? Our technicians diagnose Gaggenau cooktops across Sacramento and the Bay Area. Book your repair.