A burner that stays hot no matter what you do with the knob is a genuine safety issue, not a wait-and-see. The good news is the cause is almost always one affordable, well-understood part — but the first thing to do is cut the power so it can't start a fire. Here's what's happening and what comes next.
The knob's "infinite switch" cycles the burner on and off to set the heat. Its contacts can weld shut from arcing over time, so the burner gets continuous power and stays on high regardless of the knob. This is the #1 cause.
Check it: Confirm it by killing the breaker (the burner should cool). The switch is an affordable part, but replacing it inside a 240V range is a technician repair.
A coil element that shorts internally can feed power back so it stays energized. Less common than the switch, but it presents the same "won't turn off" symptom.
Check it: Not a DIY diagnosis. A technician tests whether it's the switch or the element — both are affordable parts.
On electronic-control ranges, a relay on the control board that switches the element can weld closed, keeping the element powered — the same failure mode as an infinite switch, on the board.
Check it: Kill the breaker to make it safe. A stuck relay on the control board is a technician repair.
Rarely, damaged or shorted wiring behind a burner keeps it energized.
Check it: Not DIY on a 240V appliance. A technician locates and repairs the fault safely.
The usual cause — an infinite switch — is an inexpensive part, and even a control-board relay is a worthwhile fix, so a stuck burner is almost always repairable. The value is in a technician safely confirming which part welded, because this is a 240V circuit and a fire risk if left running.
Last week a customer kept their appliance instead of replacing it — they installed the part themselves with the exact one we shipped, after a $50 Quick Check told them precisely what they needed. That's the whole idea: honest answer, right part, no upsell.
In Middle Tennessee or the Baton Rouge area? We'll come to you, same-day. Anywhere else in the U.S.? Send a 10-second video, a real technician tells you exactly what's wrong for $50 (credited toward the repair), and we ship you the exact part. 24/7 — text, call, or upload anytime.
Yes. A burner stuck on with continuous power is a fire and burn risk. Turn off the range's breaker immediately to cut power to it, keep flammables away, and don't use it until the stuck part is replaced.
Almost always a welded infinite switch — the knob's switch that's supposed to cycle the burner on and off has its contacts fused shut, so the element gets constant power. On electronic ranges, a stuck relay on the control board does the same thing.
Make it safe yourself by shutting off the breaker — but the repair (an infinite switch, element, or control board inside a 240V range) is a technician job for safety. The parts are affordable, so it's well worth fixing.