Frigidaire Stove Burner Stays On — How to Fix It

Common Symptoms

• Electric burner coil stays on or stays at high heat even when knob is turned down
• Burner continues heating after the knob is turned to the Off position
• Burner knob turns freely but the heating level doesn't change
• Gas burner flame remains lit after turning the knob to Off
• Gas burner flame won't reduce below high even with knob turned down
• Oven light or other burners affected when one burner is turned on (wiring issue)
• Burning smell from the control area (surface switch overheating)

Most Likely Causes

1. 1

   Failed Infinite Switch (Electric Ranges — Most Common)

   The infinite switch (surface element switch) is a bimetallic cycling switch that controls power to an electric burner coil by rapidly cycling current on and off — the ratio of on-time to off-time determines the heat level. When the bimetallic contact inside the switch welds closed (a common failure mode), the switch can no longer cycle — the burner receives continuous full power regardless of the knob position. A switch that welded in the closed position causes the burner to stay on at maximum heat and refuse to turn off until the range is unplugged. Infinite switches are model-specific and typically cost $15–$35.

2. 2

   Broken or Stripped Burner Knob (Knob Turns Freely Without Engaging)

   The burner knob has a D-shaped shaft insert that engages with the infinite switch or gas valve shaft. If the plastic insert inside the knob cracks or strips, the knob spins freely without actually turning the switch or valve shaft — making it impossible to reduce heat or turn the burner off. This failure feels like the knob 'slips' or rotates without resistance. The fix is a replacement knob — the switch or valve itself is often undamaged. Replacement knobs are typically $8–$20 and are model-specific.

3. 3

   Gas Valve Not Closing (Gas Ranges — Safety Emergency)

   On gas Frigidaire ranges, the gas valve inside the manifold controls gas flow to each burner. If the valve becomes stuck in the open position — due to debris, corrosion, or mechanical failure — gas continues to flow to the burner even with the knob in the Off position, keeping the burner lit. This is a gas safety emergency: turn off the main gas supply valve to the range (behind the range, at the gas line) immediately and do not relight the burner. Call a licensed gas technician to inspect and replace the faulty gas valve — do not attempt to service gas valves yourself.

4. 4

   Wiring Fault or Shorted Element Wire (Electric Ranges)

   The burner element on electric ranges connects to the infinite switch via two wires that terminate in push-on connectors at the element terminals. If the element wire insulation has melted and created a short — typically from long-term heat exposure at the element socket — the element may receive power continuously regardless of switch position. A melted or discolored burner socket (the receptacle the element plugs into) is a tell-tale sign of this failure. The burner socket and associated wiring must be replaced — a melted socket can arc and cause a fire.

5. 5

   Control Board Relay Stuck Closed (Smooth-Top / Induction Ranges)

   On Frigidaire smooth-top ceramic or induction ranges, the cooking elements are controlled by relays on the power control board rather than mechanical switches. A relay that welds closed sends continuous power to the heating element even after the control panel is set to Off. On smooth-top ranges, this is the equivalent of the infinite switch failure on coil ranges — the relay board must be replaced. This failure typically affects one burner zone at a time.

Quick DIY Checks

1. 1SAFETY FIRST — If the burner won't turn off, unplug the range or trip the circuit breaker immediately. For a gas burner that won't extinguish when turned to Off, turn the main gas shutoff valve behind the range to the OFF position (valve perpendicular to the gas line = off). Do not leave a burner stuck in the 'on' position unattended — an electric burner at full heat with nothing on it can damage the cooktop or ignite nearby items. Once power or gas is safely cut, proceed with diagnosis.
2. 2Check the burner knob for stripping before replacing the switch. Pull the knob straight off the shaft (most Frigidaire range knobs pull off without any tools). Look at the inside of the knob — the D-shaped shaft insert should be intact with no cracks, splits, or worn-down flat. Then look at the switch or valve shaft it was mounted on — the shaft should have a flat side (the D-shape) that the knob engages. If the knob's insert is cracked or the D-shape is rounded off, the knob is stripped and must be replaced. Replacement knobs are $8–$20 and are the cheapest possible fix for this symptom.
3. 3Test the infinite switch on electric coil ranges. Turn off the circuit breaker for the range. Pull the burner coil element out of its socket. Remove the knob from the switch shaft. To access the infinite switch, remove the cooktop (typically lift the front edge and prop it up, or remove 2–4 screws at the front) — the switches are mounted at the front of the range body, connected to the knob shafts. Disconnect the wiring to the suspect switch (photograph connections first). Set a multimeter to continuity mode. With the switch shaft in the Off position, probe the two element output terminals — there should be NO continuity (open circuit). If there IS continuity with the switch in Off, the internal contacts are welded closed — the switch has failed and must be replaced. Part numbers vary by model — search 'Frigidaire infinite switch [your model number].'

1. 4Inspect the burner socket and element wiring for heat damage (electric coil ranges). With the circuit breaker OFF, pull the burner coil element out of the socket. Look at the socket (the plug-in receptacle mounted inside the cooktop). Signs of socket failure: melted plastic around the socket opening, black or brown discoloration on the socket body or terminals, a burnt smell from the socket area, or push-on terminals that are blackened or deformed. A damaged socket must be replaced — a melted socket creates an arcing risk. Burner sockets (also called surface element receptacles) typically cost $10–$20 and should be replaced along with the element if there is any heat damage to either.
2. 5Check the control board relay on smooth-top ranges. On Frigidaire ceramic glass smooth-top ranges, there is no physical infinite switch — the cooking zones are controlled by relays on the power control board. If a heating zone stays on after being set to Off, the relay for that zone has welded closed. There is no DIY repair for a welded relay — the entire control board must be replaced. Before ordering a board, confirm the issue is the board and not the control panel: press Cancel/Off on the control panel to clear all settings, then cut power at the breaker for 5 minutes and restore. If the zone immediately heats up again when power is restored (without any button being pressed), the relay is definitively stuck closed — replace the board.
3. 6Diagnose gas valve failure if a gas burner won't turn off. With the gas supply turned off (shutoff valve behind the range in the off/perpendicular position), remove the burner cap and grate from the affected burner. Look for visible debris or corrosion at the burner head area. Turn the gas supply back on briefly and attempt to turn the knob to Off again — if you can now turn the knob to Off and the valve closes (burner goes out), an obstruction may have been cleared. If the burner relights immediately after being turned off or the valve clearly isn't responding to the knob, the gas valve is mechanically failed. Call a licensed gas technician — gas valve replacement requires a certified professional and must not be attempted as a DIY repair.
4. 7Replace the infinite switch if it tested failed (electric coil ranges). With the circuit breaker OFF and the switch accessible, note or photograph the wire positions on the old switch (there are typically 3–5 wire connectors). Remove the mounting screws or clips holding the switch to the range body and disconnect all wires. Install the new switch in the same position, reconnect all wires to their correct terminals, and secure with mounting hardware. Replace the cooktop and knob. Restore power and test — turn the burner on to a low setting and verify it heats, then turn to Off and verify it shuts off completely. Infinite switches for Frigidaire ranges are typically $15–$35.

Repair vs Replace

Recommended Tools & Parts

• Frigidaire Infinite Switch (Surface Element Switch)

  Replacement infinite switch (burner control switch) for Frigidaire electric coil ranges. Controls current cycling to the burner element. Replace when the switch contacts weld closed and the burner stays on at full heat regardless of knob position. Model-specific — search with your Frigidaire model number.

  $15–$35

  Buy on Amazon →

• Frigidaire Range Burner Knob

  Replacement burner control knob for Frigidaire ranges. Fixes the 'knob turns freely without engaging' symptom — the D-shaft insert is cracked or stripped. Much cheaper than replacing the switch. Model-specific — verify compatibility with your full model number.

  $8–$20

  Buy on Amazon →

• Frigidaire Surface Element Burner Socket (Receptacle)

  Replacement burner socket/receptacle for Frigidaire electric coil ranges. Replace when the socket shows melting, discoloration, or burnt terminals from prolonged overheating. Always replace alongside a damaged burner element — a failed socket can arc and cause a fire.

  $10–$20

  Buy on Amazon →

• Digital Multimeter

  Required for testing infinite switch contacts (continuity mode — switch Off position should show no continuity). Also useful for verifying circuit breaker operation and wiring continuity during diagnosis.

  $15–$35

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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