Induction Cooktop Not Heating? Pan Detection and Error Codes
Induction cooktops are now standard in new DC-area condos and in kitchen renovations across Arlington, McLean and Bethesda, and they generate a distinctive set of service calls. Most begin with 'it just stopped heating' and end with a conversation about cookware, because an induction element can only heat a pan it can magnetically couple to. A smaller number are genuine electronics failures, and those are worth recognizing early because the parts are expensive.
Pan detection: the most common 'fault'
Each induction zone has a coil that creates a magnetic field, and a sensor that checks whether a suitable pan is sitting in it. If the pan is aluminum, copper, glass or thin stainless steel without a magnetic base, the zone will beep, blink its power level or show a pan symbol, and never heat. The test is a fridge magnet: if it grips the pan bottom firmly, the pan will work. Pans that are too small for the zone, warped so only the rim touches, or sitting off-center trigger the same warning. A zone that heats one pan and refuses another is working correctly.
Overheating and the cooling fan
Induction cooktops contain power electronics that must be cooled by a fan underneath. If the cooktop is built into a cabinet with no ventilation gap, if the fan intake is blocked by a drawer stuffed with foil and pans, or if the fan itself has failed, the cooktop will reduce power or shut a zone off mid-cook and show an over-temperature code. You can usually hear the fan when the cooktop is working hard. Silence under heavy use, or a cooktop that always cuts out after 15 minutes of searing, points to cooling. Check the installation gap specified in the manual before assuming the electronics are bad.
Reading the error codes
Codes vary by brand but fall into a few families. Bosch and Thermador use E-codes; a flashing 'U' or pan symbol is detection, E22 or E25 point to the control electronics, and a code with a fan symbol indicates overheating. GE Profile and Cafe show F-codes; F30 series relate to zone sensors and F60 series to the power board. Samsung uses C-codes and Frigidaire E-codes with similar divisions. The manual decodes them, but the useful split is simple: detection codes are about the pan, temperature codes are about ventilation or a stuck hot pan, and board codes are a service call.
Zones that work intermittently or at low power only
A zone that heats but never reaches a boil, or that works at low settings and shuts off at high, usually has a failing power module, a loose connection from the module to the coil, or a cracked ferrite in the coil assembly. On cooktops with bridge zones and power-boost features, a boost that no longer works while the zone otherwise heats is an early sign of the same module failure. These are the repairs where a quick diagnosis saves money, because a module that is failing slowly can take other components with it.
Control lockout and the glass
Before booking, confirm the cooktop is not simply locked. Every induction cooktop has a child lock, typically a key symbol you hold for three seconds, and a spilled pot of water across the touch controls will lock or scramble them until the glass is dry. Wipe the controls completely dry and power-cycle the cooktop at the breaker. A crack in the glass, however small, is a different matter: liquids reach the electronics beneath and the cooktop should not be used until the glass is replaced.
Repairing induction cooktops
Induction service calls for a technician who has worked on the specific brand, because each uses its own module layout and diagnostic mode. We service Bosch, Thermador, GE and Cafe, Samsung, LG, Frigidaire, KitchenAid and Miele induction cooktops across the DC metro. Module and coil repairs are more expensive than gas or radiant-electric parts, so the quote comes after diagnosis and you decide before any work. When you book cooktop repair, note which zones are affected and whether the problem happens with every pan - that detail alone separates a service visit from a cookware conversation.
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