How an LG cooktop signals trouble
LG cooktops come in three forms — electric radiant, induction and gas — and they carry only a thin set of fault codes, so most diagnosis is read from observable behaviour rather than a code on the screen. Knowing your type is the start of any LG cooktop repair, because a gas burner, an induction coil and a radiant element each fail in their own characteristic way.
The few codes you may see
The real cooktop codes are limited. F3 flags a touch-control key fault, F33/F34 an induction-burner sensor issue, H5 the hot-surface indicator (a status light, not a fault), and PF a power failure. Importantly, there is no pan-detection error code — an induction surface that “will not heat” with the wrong cookware is normal Cookware Detection behaviour, not a fault, and is resolved by using magnetic, induction-ready pans centred on the element.
The symptoms to diagnose by
Most cooktop complaints are observable: a surface that will not power on, an element or burner that will not heat, one that will not reach temperature, an induction element that clicks or cycles, controls that are unresponsive, cracked glass, or a hot-surface light that stays lit. On gas, a burner that will not light points at the igniter, a wet or misaligned cap or a clogged port; on induction, a surface that will not respond points at the control or the coil; on electric, an element that stays cold points at the element, switch or control.
What to check, and when to call
For gas, confirm the burner caps are seated and dry and the ports are clear; for induction, confirm you are using induction-ready cookware. A surface that will not power on, an element that will not heat after these checks, or cracked glass needs an experienced technician with genuine parts. See the guides on a cooktop that will not turn on and an induction cooktop that will not heat, browse the error codes library, then book cooktop repair. Confirm your model on the manufacturer’s site at lg.com/us.