Oven Won’t Turn Off? Here’s How to Fix It

By Fix4U Team
Oven, Kitchen Appliances

It can be incredibly frustrating when your oven won’t turn off. You cook your meal, go to turn the oven off, and realize it’s still running hot even after you’ve hit the off button. Now panic starts to set in – is my oven broken? Will it ever turn off? What should I do?

Not to worry – an oven that won’t shut off is a common problem that can often be fixed with some simple troubleshooting steps. Here’s a comprehensive guide on how to diagnose and repair an oven that refuses to turn off.

Common Causes Behind an Oven That Won’t Turn Off

Before jumping into troubleshooting, it helps to understand what components and issues typically cause an oven to remain constantly on. The most common culprits include:

Fix4U Repairs' Technicians Fixing Oven Won't Turn Off Problem In Gta
  • Faulty oven control board – The control board is the “brain” of your oven, controlling all functions like baking, broiling, and turning on/off. If it malfunctions, it can send constant signals to keep heating elements engaged.
  • Damaged bake or broil heating elements – If the electrical bake or broil elements get damaged, they can get stuck heating even when the oven is off.
  • Faulty thermostat or temperature sensor – These components tell your oven when to cycle on heat. If broken, it may never “know” when to stop heating.
  • Broken touchpad – Modern ovens have touchpad controls. If these are damaged, it can cause the oven to get stuck on.
  • Faulty gas valve (for gas ovens) – The gas valve controls gas flow to the oven burner. A malfunction can allow gas to keep flowing to the burner.
  • Short circuit – Electrical wiring issues like a short can constantly engage heating elements.

Knowing the problem components helps guide troubleshooting steps when attempting a DIY repair.

Troubleshooting Steps to Diagnose an Oven That Won’t Turn Off

When your oven won’t stop heating, use the following troubleshooting guide to methodically narrow down the issue:

1: Check the Oven’s Control Board

The oven control board, also called the main PCB, controls all the oven functions through its integrated circuits. It sends voltage signals that engage the heating elements, igniters, blowers, and other components. A faulty control board can keep sending constant voltage to the heating elements.

On electronic control board ovens, check for any error code displays. Certain control board issues display error codes like F1, F3, or F7. This makes diagnosis easier. Examine the control board for any visible damage – discoloration, burning, fluid leaks, or corroded connections can point to a control board problem.

Use a multimeter to check for power outputs from the control board during the times when the oven should be off. Any voltage signals leaving the board during the off-times indicate a defective control board that needs replacement.

Get professional assistance if the oven control board requires troubleshooting beyond visual checks. Diagnosing actual circuit faults requires advanced technical skills.

2: Inspect the Bake and Broil Heating Elements

Electric ovens have separate lower (bake) and upper (broil) heating elements. These heating coils or tubes can fail in ways that will keep them constantly engaged.

For coil elements, look for breaks or separations in the coiled wire. Damaged sections can remain constantly hot. Examine tube-style broil and bake elements for cracks or holes. This damage can prevent them from turning off.

Remove and visually inspect lower and upper elements. Turn oven to bake mode – the lower element should heat up while the upper remains off. Then switch to broil and verify only the upper element engages. This confirms proper operation.

Use an ohmmeter to check element resistances. Refer to your oven’s service manual for the proper resistances. A significantly lower reading indicates a short and defective element requiring replacement.

3: Test the Oven Thermostat

The oven thermostat cycles the heating elements on and off to maintain the selected baking temperature. A thermostat stuck in the “closed circuit” position will never stop the heat.

Unplug the oven before testing the thermostat. Verify it has continuity through the closed circuit contacts using a multimeter when set to a hot temperature. No continuity on a hot setting indicates a bad thermostat needing replacement.

For older model ovens, turn the thermostat probe by hand (with power disconnected) and check that the switch opens and closes audibly when turning to different temperatures. If not, the contacts may be stuck requiring a new thermostat.

Newer electronic ovens may have a thermistor temperature sensor rather than a mechanical thermostat. An easy way to test the thermistor – heat the oven to 300°F, then disconnect power and carefully remove the sensor. It should read around room temperature on your multimeter if working properly. If not, it needs replacement.

4: Check the Temperature Sensor

Many modern ovens have a separate temperature sensor apart from the thermostat. This sensor tells the control board the actual oven temperature. If it fails, the board never receives the signal that the proper temperature has been reached.

Locate the temperature sensor inside the oven cavity, usually on the back wall. Unplug the oven before testing. Measure the sensor resistance with a multimeter – you should get readings that vary with temperature. Compare to proper ranges for your oven model.

If the temperature sensor does not change resistance as it heats up and cools down, it requires replacement. This is a very common cause of an oven not turning off.

5: Test the Touchpad

Membrane switch touchpads have largely replaced classic oven knobs. While very convenient, they can also fail and cause an oven to keep operating. Examine the touchpad for any damage – cracked membrane, etching/discoloration from liquid spills, or impact points from dropping objects on it. Damage like this can activate the touch circuits beneath.

Unplug the oven and remove the touchpad for inspection. Look for fluid intrusion or burnt spots on the back. You can temporarily disconnect individual membrane connectors and turn the oven back on to test. If the oven shuts off with a connector removed, that points to a faulty touchpad button.

To fully test, use a multimeter to check for continuity when pressing the OFF button. If you do not get continuity, the touchpad requires replacement.

6: Check the Gas Valve on Gas Ovens

For gas ovens, a stuck open gas valve allows gas to keep flowing to the burner, meaning the oven won’t stop heating.

Visually inspect the gas valve for damage or corrosion. Use the multimeter to test the gas valve coils for proper resistances – consult your service manual for specifications. Incorrect resistance means the gas valve solenoid needs replacement.

Watch the burner tube through the oven window while hitting the OFF button. If gas flow continues, it points to a bad valve.

Warning: Given the dangerous nature of gas appliances, we recommend having a professional technician handle any gas oven valve testing and repairs beyond visual inspection. Do not take chances with gas leaks or explosions.

7: Check for Electrical Short Circuits

If all other components check out okay, faulty oven wiring can also cause a unit to remain on. Short circuits or compromised insulation can bypass oven controls and keep power flowing to the heating elements.

Check the oven cavity, especially near heating elements, for discoloration or scorch marks indicating excessive heat. This points to a thermally damaged wire shorting somewhere.

Thoroughly inspect wiring harnesses leading from the control board for damage. Use a multimeter to check for shorts between wires.

Note that accessing oven wiring requires in-depth disassembly and should be left to trained appliance repair technicians. Proper safety precautions are crucial when conducting electrical checks on any major appliance.

8: Turn Off Power at the Breaker

If you cannot resolve an oven that persists in heating, turn off power to it at the home circuit breaker box as a last resort. This will at least prevent fire hazards or damage as you arrange for proper repairs.

Leave the oven unplugged and breaker switched off until a technician determines the exact problem. Ovens that stay on despite hitting OFF pose serious safety risks and should never be left unattended until fixed.

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Getting Professional Repair Assistance

While the steps above can resolve many cases of a “stuck on” oven through DIY troubleshooting, we strongly recommend professional assistance for:

  • Control board malfunctions beyond simple error code diagnosis
  • Accessing and testing oven wiring harnesses
  • Any major disassembly of gas or electric oven components
  • Replacement of faulty gas valves and fittings

Technicians have specialized tools, in-depth product knowledge, and training for safely diagnosing and repairing ovens that refuse to turn off. Do not take risks trying complicated repairs yourself.

At Fix4U Repairs, we have over 6 years experience fixing every make and model of appliance. Our technicians are factory-trained and can quickly and safely get your faulty oven working again. Call (647) 363-5205 today to schedule a fast oven repair appointment.

Preventing Future “Oven Won’t Turn Off” Problems

To avoid future oven issues like a broken main control or stuck-on heating elements, follow these proactive maintenance tips:

  • Keep your oven clean – built up grease and food spills can lead to component failures over time.
  • Have your oven professionally serviced once a year – preventative maintenance greatly extends the lifespan of major appliances.
  • Use oven liners and covers – protects the oven bottom and heating elements from drips and spills during cooking.
  • Avoid slamming or hitting the oven door – impact damage can ruin sensitive electronic components.
  • Install a GFCI protected outlet for the oven – helps protect from electrical shorts and malfunctions.
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