Maytag Stove Burner Stays On — Infinite Switch, Knob & Wiring Fix
A Maytag electric stove burner that stays on after the knob is turned to OFF is a fire hazard and must be treated as an emergency. Your first action should be to shut off the circuit breaker for the range immediately — do not leave an active element unattended. Once power is off, the repair is typically straightforward. The most common cause is a failed infinite switch WP3149491 — the control behind the knob that regulates burner temperature by cycling power on and off. When an infinite switch fails in the closed position, it sends continuous power to the element regardless of knob position. This is especially common on the front burners, which see the most use. A broken burner knob WP8273103 is the second most common cause. If the knob's internal cam breaks, it can spin freely without actually moving the switch shaft — the knob appears to be at OFF but the switch is stuck in a heat position. Finally, a wiring short in the harness that connects the switch to the element can hold the element on at a fixed heat level regardless of switch position. All repair work must be done with the range unplugged or the breaker off. This is not optional for this repair — the switch and wiring are in the 240V circuit.
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Common Symptoms
- Surface burner won't turn off
- Burner stays on after knob turned to off
- Knob spins freely
- Burner control feels loose
Most Likely Causes
- 1
Infinite Switch Failure (WP3149491)
The infinite switch WP3149491 (also called the surface burner switch or simmerstat) controls how much power reaches the surface element by rapidly cycling the circuit on and off at varying duty cycles. When the switch's internal bimetal contacts weld together in the closed position, the element receives constant full power regardless of knob setting — the burner appears stuck on. Test by unplugging the range and checking switch continuity with a multimeter: with the switch set to OFF, you should read OL (open circuit). Continuity at the OFF position confirms the switch has failed closed.
- 2
Broken Burner Knob (WP8273103)
The burner knob WP8273103 connects to the infinite switch shaft via an internal cam or D-shaped bore. If the plastic cam breaks, the knob turns freely without rotating the switch shaft — the knob feels like it's turning to OFF but the switch remains in whatever position it was in last. Check by removing the knob and observing whether the D-shaped shaft rotates when you turn the knob. If the shaft doesn't move with the knob, the knob is broken and must be replaced.
- 3
Wiring Short or Harness Damage
A wiring short in the harness between the infinite switch and the surface element can bypass the switch entirely, delivering continuous power to the element. This is less common than switch failure but can occur after grease or liquid intrusion into the wiring channel, or after a power surge. Inspect the wiring harness for melted insulation, burned connectors, or heat damage. Any wiring that shows carbon tracking or melting must be replaced.
- 4
Surface Element Short (WP316224)
In rare cases, the surface element WP316224 itself can develop an internal short that causes it to draw power even when the switch is open. This is typically accompanied by discoloration on the element, uneven glowing, or a burning smell. Test by unplugging the range, disconnecting the element leads, and measuring resistance across the element terminals — a healthy coil element reads 20–80 ohms depending on size; near-zero ohms indicates an internal short.
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Quick DIY Checks
Turn off power at the circuit breaker IMMEDIATELY if the burner won't shut off — a stuck-on burner is a fire hazard. Do not leave an active element unattended under any circumstances.
Unplug the range or shut off the breaker before any repair work — the switch and element wiring are in a 240V circuit. Do not work on the switch with power on.
Do not leave the house or go to sleep with a stuck burner — even if you shut off the breaker, the element may still be hot for 30+ minutes.
This is a fire hazard — prioritize shutting off power over diagnosing the cause. Safety first, diagnosis second.
- 1Turn off power at the breaker IMMEDIATELY if the burner won't shut off — this is a fire hazard; do not leave the range unattended with a stuck burner
- 2Check the burner knob WP8273103 — remove knob and check if the D-shaped switch shaft rotates when you turn the knob; if shaft doesn't move, knob is broken and must be replaced ($10–$25)
- 3Test infinite switch WP3149491 — unplug range, remove switch, test continuity in OFF position; continuity (not OL) at OFF position = switch failed closed, replace ($25–$60)
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Repair vs Replace
A stuck burner is almost always a single-component failure — infinite switch, knob, or element. All three are inexpensive DIY repairs under $60 in parts. Only consider replacement if multiple switches have failed or if there is widespread wiring damage from a fire or liquid intrusion event.
Est. Repair Cost
$20–$120 DIY (infinite switch WP3149491 $25–$60, knob WP8273103 $10–$25, element WP316224 $20–$50)
Est. Replacement Cost
$800–$1,800 for a new Maytag electric range
Recommended Tools & Parts
- Buy on Amazon →
Maytag Infinite Switch (WP3149491)
Replacement surface burner infinite switch for Maytag electric ranges. Controls element heat by cycling power duty cycle. Replace when switch fails closed (continuity in OFF position), causing burner to stay on. Direct-swap replacement.
$25–$60
- Buy on Amazon →
Maytag Burner Knob (WP8273103)
Replacement surface burner control knob for Maytag electric ranges. D-bore connects to infinite switch shaft. Replace when knob spins freely without moving switch shaft, indicating broken internal cam.
$10–$25
- Buy on Amazon →
Maytag Surface Element (WP316224)
Replacement surface heating element for Maytag electric ranges. Replace when element shows internal short (near-zero ohms resistance), uneven glowing, or visible breaks. Measure resistance before replacing — 20–80 ohms is normal range.
$20–$50
Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.
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Frequently Asked Questions
- Is it safe to use my Maytag stove if one burner is stuck on?
- No — a stuck-on burner is a fire hazard. Shut off power at the circuit breaker immediately and do not use the range until the burner is repaired. Do not simply avoid using that burner while leaving the range plugged in — a stuck infinite switch can overheat even without intentional use. Repair the switch WP3149491 or knob WP8273103 before restoring power to the range.
- How do I test a Maytag infinite switch with a multimeter?
- Unplug the range and remove the infinite switch from the control panel (usually 2 screws and a wiring connector). Set your multimeter to resistance (ohms) or continuity mode. With the switch shaft turned to the OFF position, probe across the element output terminals (L1 and H1, or L2 and H2 — check your wiring diagram). A good switch reads OL (open circuit) at OFF position. If you read continuity or low ohms at OFF, the switch has failed closed and must be replaced with WP3149491.
- Why does my Maytag burner knob spin freely without turning off?
- A freely spinning knob almost always means the internal D-bore or cam that engages the infinite switch shaft has broken. The knob is a plastic assembly with a D-shaped hole that grips the switch's flat-sided shaft — when this plastic breaks, the knob rotates but the shaft stays still. Remove the knob and look at the back — if you see broken plastic or the shaft doesn't turn when you move the knob, replace the knob with WP8273103. This is a $10–$25 fix.