Electric cooktop burner not working: how to diagnose it
Cooking
Photo: Curtis Adams / Pexels Electric cooktops fail in a limited number of ways, which makes them relatively easy to diagnose from the symptoms alone. Whether you have coil elements or a smooth ceramic top changes the parts involved but not the logic. Start by describing exactly how the burner misbehaves, because that detail points almost directly at the cause.
Coil elements: swap to test
On a coil range, the fastest test costs nothing. Let everything cool, unplug the suspect coil from its receptacle, and plug it into a burner you know works. If it heats there, the element is fine and the receptacle or its wiring is at fault. If it stays dead, the element itself has an open circuit. Coil elements run $60 to $140 installed.
Burned receptacles and terminal blocks
Coil element receptacles arc over time, especially when a coil is repeatedly plugged in slightly loose. The result is a pitted, blackened contact that no longer conducts. Replacing a burned receptacle is a common repair at $130 to $220. If you see scorching, do not just reinsert the element, because the arcing will worsen and can char the wiring behind it.
Burner stuck on high means the infinite switch
The infinite switch is what cycles power on and off to create your low, medium, and high settings. When its contacts weld shut, the burner runs full power regardless of the knob. This is the classic symptom. A stuck-on burner is a fire risk, so turn the breaker off until it is repaired. Infinite switch replacement is generally $160 to $280.
Smooth-top radiant elements
Under a ceramic glass top, each burner is a coiled ribbon element in a shallow insulated dish. They fail open just like coils but cannot be swapped for testing, so a technician measures resistance, typically 20 to 60 ohms depending on wattage. An open reading confirms failure. Radiant element replacement runs $200 to $380 because the glass top has to come off.
When multiple burners quit at once
Two dead burners on the same side often means a lost leg of 240-volt power, either at the breaker or the terminal block. Check that the double-pole breaker is fully reset, pushing it firmly off then on. If burners are dead but the oven and clock work, a technician should test both legs at the terminal block, where corroded connections are common on older ranges.
Cracked glass tops
A crack in a ceramic cooktop is not cosmetic. Spills reach live elements and moisture creates a shock path, so a cracked top should be taken out of service. Glass top replacement is expensive, commonly $400 to $800 with labor, which frequently pushes people toward replacing the whole cooktop instead.
Safe checks versus technician work
Swapping and inspecting coil elements with the range unplugged is reasonable DIY. Anything requiring the cooktop to be lifted, the terminal block opened, or a switch replaced involves 240-volt connections capable of causing serious injury. Chicagoland homeowners can usually get same-day diagnosis on cooktop faults, which is worth it given the shock risk.
Frequently asked questions
Why does my smooth-top burner cycle on and off constantly?
That is normal. Radiant elements cycle to hold a temperature, and you will see the glow come and go even at high settings, controlled by a limiter that protects the glass.
Can I use a cooktop with one dead burner?
Yes, as long as nothing is stuck on and there is no visible scorching or cracked glass. It is safe to continue while you schedule the repair.
Why are there scratches under my pans on the glass top?
Dragging cast iron or pans with rough bases across the glass scores it. Lift pans rather than sliding, and clean grit off the surface before cooking.