Why Is My Oven Not Heating Up Properly?

By Fix4U Team
Oven, Kitchen Appliances

Having an oven that doesn’t heat up properly can be extremely frustrating. Whether you’re trying to bake cookies for the kids or cook a nice roast for dinner, an underheating oven can ruin your plans. At Fix4U Repairs, we understand how inconvenient oven issues can be. That’s why we’ve put together this comprehensive guide on troubleshooting oven heating problems. Read on to learn some of the most common reasons your oven isn’t getting hot enough and how to fix them yourself or determine if you need to call in a professional technician.

Check the Power Supply

The first thing to check is whether the oven is getting power. Here are some easy things you can inspect:

  • Make sure the oven is plugged into a working electrical outlet. Try plugging in a lamp or other appliance to confirm the outlet is providing power.
  • Check your electrical panel for any tripped breakers or blown fuses related to the oven circuit. Reset breakers and replace any blown fuses.
  • Inspect the power cord on the back of the oven for damage. Frayed/melted areas can prevent sufficient power from reaching the oven.
  • Test for voltage at the outlet while the oven is on using a multimeter. You should get a reading of approximately 240 volts. If voltage is lower, there could be a wiring issue.

If the oven outlet is not getting power, you’ll need to further troubleshoot the electrical supply. Contact an electrician if you suspect a wiring problem.

Inspect the Heating Element

Electrical ovens have heating elements that generate the heat for baking and broiling. Over time, these elements can fail or burn out. To check the element:

Fix4U Repairs' Technicians Fixing Oven 
 Not Heating Properly Problem In Gta
  • Carefully remove the bottom panel in the back of the oven to expose the baking element.
  • Visually inspect the element for signs of damage like cracks, breaks, or burn marks. Also look for darkened/melted spots.
  • Use an ohmmeter to check the resistance of the element. Refer to your owner’s manual for the correct ohms reading. A drastic difference means the element needs replacing.
  • Check that the element terminals are not corroded and wires are intact. Faulty connections can prevent the element from heating.

If the baking element is damaged or readings are off, it will need to be replaced. Make sure power is disconnected before doing any repair work. Replacement heating elements can be purchased online or from appliance parts suppliers.

Examine the Temperature Sensor

The oven temperature sensor monitors the internal oven temperature and signals the control board when to turn the heating elements on and off. If this sensor is malfunctioning, it could prevent the oven from reaching the target baking temperature. Here’s how to test the sensor:

  • Locate the temperature sensor inside the oven cavity. It’s typically found affixed to the back wall.
  • Make sure the sensor probe isn’t touching the oven wall, as this can influence the temperature reading.
  • Remove the sensor connections from the back of the control board. Identify the sensor wires (usually red and white or blue and yellow).
  • Use a multimeter to check the sensor resistance at varying temperatures. Consult a temperature/resistance chart. Resistance should change as temperature increases.
  • If readings are inaccurate, replace the faulty temperature sensor. Make sure the replacement is an exact match.

Check for an Air Leak

If the oven door seal is compromised or the door hinges are loose, cool air can seep into the oven cavity during operation. This influx of cooler air makes it difficult for the oven to reach and maintain the target temperature. To find leaks:

  • Shut the oven door on a piece of paper. Try pulling the paper out while keeping the door closed. If it slides out easily, the seal needs to be replaced.
  • Inspect the door seal for any cracks, gaps, or damage that could allow air to pass through. Look closely at the corners.
  • Test the door hinges by opening and closing the door. Sagging, loose doors can break the seal.
  • Replace any damaged oven door gaskets or tighten loose hinges. Severe door seal damage may require changing the entire oven door.

Inspect the Control Board

The oven control board regulates power to the heating elements based on feedback from the temperature sensor. If the control board is defective, it can lead to inaccurate temperature control. Here’s how to test the main control board:

  • Turn the oven on and check for any error message codes. Error codes indicate a problem with the control board.
  • Remove the control board cover and look for any burnt components or loose wiring connections. Signs of overheating on the board often means it needs replacement.
  • Use a multimeter to check for continuity of circuits/connections on the control board while the oven is on. Compare readings to a wiring diagram. Any anomalies indicate a bad control board.
  • If any of the above tests reveal an issue, replace the oven control board. Make sure the new control board is an exact replacement part number for your model.

Troubleshoot Gas Supply (Gas Ovens)

For ovens using natural or propane gas, insufficient gas supply will affect heating performance. Issues to look for include:

  • Make sure the gas line shut-off valve is fully open. Close then reopen the valve to reset it.
  • Inspect the flexible gas hose and fittings for kinks, damage, or blockages. Straighten any kinked sections of gas line.
  • Clear out any dust or debris inside the gas line using compressed air. Clogged gas ports can restrict flow.
  • Test for gas pressure using a manometer. Pressure should be between 4-10 inches of water column. If pressure is low, contact the gas company.
  • Look for obstructed/detached orifices or burners inside the oven which can limit gas flow. Reattach any loose parts.
  • Clean caked on food debris from the oven burner ports and ignition electrodes using a wire brush.

Call a certified gas technician immediately if you smell gas during inspection or if any parts requiring replacement. Trying to repair gas oven components on your own can be extremely hazardous.

Examine the Igniter

In gas ovens, the igniter creates the spark needed to light the oven burner. If the igniter is dirty or defective, gas will not ignite and heat the oven. To assess the igniter:

  • Locate the igniter next to the oven burner. It will appear as a small metallic probe.
  • Check for any cracks or damage to the ceramic insulator around the igniter probe. Any cracks can prevent sparking.
  • Remove any grease or food splatter on the probe with rubbing alcohol and a scrub brush. Buildup on the igniter tip can inhibit sparking.
  • Observe the igniter while the oven is on. It should visibly spark to light the burner. No spark indicates a bad igniter.
  • Use an ohmmeter to check igniter resistance based on your oven model specifications. Resistance out of range means replacement is needed.

Faulty oven igniters are easily replaceable by homeowners. Make sure to match the replacement part number exactly. Never touch an igniter probe while the oven is on to avoid electrical shock.

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When to Call an Oven Repair Professional

While many oven heating issues can be addressed with basic troubleshooting, there are times when it’s best to call in a professional:

  • If you smell gas at any point, immediately shut off the gas line and call the gas company and oven technician. Never try to resolve a potential gas leak yourself.
  • For any repairs involving gas lines, burners, or the gas igniter – call a certified gas appliance repair technician. Improper repairs can lead to dangerous leaks or combustion issues.
  • If you find any evidence of arcing or electrical shorts inside the oven – call an oven repair specialist. Do not try to resolve electrical shorts yourself due to severe shock risk.
  • If the oven overheats, stops working entirely, blows a fuse, or shows major error codes – discontinue use and call an appliance technician immediately. The unit may have a major failure that needs pro repair.
  • If you determine the issue is with a faulty control board – it’s usually easier and more cost-effective to call an oven repair company to source and replace the exact matching control board.

Trying to DIY repairs without proper training can put you and your home at risk. Our technicians have the knowledge, parts, and tools to accurately diagnose issues and get your oven heating safely again.

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