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5 Reasons Gas Oven Won’t Heat Up Properly and Tips What to Do

Technically Reviewed by Oleg Chudnovski on Nov 11, 2025 | Written by Spark Service PRO Editorial Contributors

What you’ll find in this service repair guide

• Common reasons why your gas oven doesn’t heat up
• Reason #1 – The igniter is faulty
• Reason #2 – The spark electrode is damaged
• Reason #3 – The thermostat doesn’t work
• Reason #4 – The temperature is not calibrated correctly
• Reason #5 – The control or relay board is malfunctioning
• Troubleshooting when your gas oven is not heating up
• Why You Should Choose Spark Service PRO for Your Needs

Gas ovens have been around for approximately two centuries. We can find them not only in our homes but in restaurants as well. All well-known brands manufacture different types and models of gas appliances for residential and light commercial use. The most famous makers in Canada are LG, Bosch, Kenmore, GE, Samsung, KitchenAid, Whirlpool, Frigidaire,  and others.

If you enjoy cooking and having dinner with your family at home, your gas oven is the heart of your kitchen. And when it doesn’t work, it makes you feel frustrated. One of the most common problems is that your gas oven doesn’t heat up or the food isn’t heating up enough.

Having trouble with your gas oven not heating up properly? Here are five common reasons why this might be happening, along with tips on how to troubleshoot and resolve the issue.

1. The igniter is faulty:
   Check and replace if necessary.
2. The spark electrode is damaged:
   Inspect and replace if necessary.
3. The thermostat doesn’t work:
   Test and replace it if it’s malfunctioning.
4. The temperature is not calibrated correctly:
   Calibrate the settings as needed.
5. The control or relay board is malfunctioning:
   Troubleshoot or replace if necessary.

For more detailed information, please refer to our recommendation guide below. If you fail to define and solve the problem, the licensed technicians at Spark Service PRO are at your service to do their best to get your gas oven working.

Common Causes of a Gas Oven Not Heating Up

When you start baking or broiling, set the oven temperature to 350°F for preheating. Then, you place your dish in the oven and wait. A little while later, you turn the light on to check how the process is going. And when opening the oven door, you realize that the temperature is not rising. What happened? Why won’t my gas oven heat up? Before we discuss the potential problems, let’s review how a gas oven works.

When you choose the function to bake or to broil in your gas oven, the control sends current to the igniter or spark electrode. After that, the igniter or spark ignites the gas into a flame to heat up the oven. The igniter will keep the safety valve open until the oven reaches the assigned temperature. A thermostat bulb monitors until the selected temperature is reached. Then, the control shuts off the voltage to the igniter, and the gas supply to the burner is shut off as well. This repeated cycle in the baking or broiling is to maintain the proper temperature during the process.

It should be considered that the selected temperature is the average because it fluctuates throughout the baking or broiling process. The convection ovens reduce this fluctuation due to the fan, with or without a heating element, that circulates the heated air over the oven.

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Thus, the possible reasons why your gas oven doesn’t heat up can be the following:

Reason #1 – The igniter is faulty

Sooner or later, an igniter stops working correctly. Always, after turning the oven on, keep an eye on whether the igniter begins to glow. If the burner doesn’t light, the igniter is far more likely to be faulty.

Reason #2 – The spark electrode is damaged

Some gas ovens use a spark electrode to ignite the gas. Any damage to this component could cause it to fail.

Reason #3 – The thermostat doesn’t work

The thermostat monitors the temperature in the oven and defines when the current should be shut off. Thus, it’s necessary to determine whether this part has electrical continuity. It can be defective.

Reason #4 – The temperature is not calibrated correctly

Sometimes, your gas oven may be heating, but the display shows the wrong temperature. This indicates that the gas oven is not calibrated correctly.

The wire connection is burnt or not tight enough. Generally, an igniter or electrode power supply wire can burn near the heat source. Such damages are mostly visible. In this case, ensure the wire is not damaged and is securely in place.

Reason #5 – The control or relay board is malfunctioning

If you are convinced and exclude the failure of other parts, the possible cause can be in the control or relay board.

Troubleshooting When Your Gas Oven Is Not Heating Up

Your gas oven is one of the most important appliances, though you may not use it very often. But if you’ve decided to bake a cake, cookies, or broil something, you need it. When it doesn’t work, it’s frustrating. Here, you can find solutions to common issues that won’t take long to resolve.

But first of all, you should know that Ontario regulations require a safety certificate for various activities. No person shall install, alter, purge, activate, repair, service or remove any appliance or any equipment unless the person is the holder of a certificate for that purpose under Ontario Regulation 215/01

Igniter — As time goes on, the igniter weakens. The temperature is much lower, and the oven won’t heat past 350°. You can test the igniter for continuity using a multimeter. You should check a continuous electrical path in it. If you find out it is damaged, it must be replaced.

The oven takes a while to heat up. Here are several reasons to try troubleshooting. As noted earlier, you may encounter an issue with the thermostat or temperature sensor. You can verify its functionality using a multimeter and an ohmmeter to ensure it works properly.

If everything is functional, you should recalibrate the oven. Preheat the oven to 350°F. Check the temperature inside with a thermometer every 20 minutes from 90 to 180 minutes. Then, you should sum up all the readings and divide them by the number to calculate the average temperature of your oven. After that, adjust the oven’s temperature dial accordingly.

If you take simple steps to verify the issues with the parts of your oven and realize that it’s still not working, the problem may be with the control board or relay board. As you can’t test it easily, you should inspect it for signs of burning or short-circuit elements (for example, a self-cleaning oven fire).

But the problem with the gas oven is not fun, and sometimes it isn’t easy to treat on your own. In this case, trust pros from Spark Service PRO to handle troubleshooting.

Why You Should Choose Spark Service PRO for Your Appliance Repair Needs

If you encounter any issues with your gas oven, it’s important not to attempt to resolve them yourself. Trust the expertise of professional technicians at Spark Service PRO for troubleshooting and repairs. Our skilled repairmen offer top-notch gas oven repair services.

With 20 years of experience in the field, we are licensed to provide repair, maintenance, and installation services for a range of popular brands and high-end kitchen appliances, including Wolf, Viking, Thermador, Bertazzoni, Fulgor Milano, and Electrolux. Moreover, we take pride in being an authorized repair service for Bertazzoni, Fulgor Milano, LG, DCS, and Fisher & Paykel.

Spark Service PRO suggests the following advantages:

• 20 years of gas fitter experience in the repair, installation and maintenance of ovens
• Same-day services for most brands when submitting a request online
• Toll-free calls with the repair
• Technical and Safety Authority (TSSA certificates for all gas technicians to remove the RED TAG from your gas appliance.

When you require help with stove and oven repair, don’t delay your call right now at 1-888-242-0777. Spark Service PRO is always ready to offer quality services, ensuring you feel calm in emergencies. It’s time to contact us today!

We’re here for you 7 days a week, including weekends and holidays. Our local experts serve the Greater Toronto Area and Simcoe County, and we’re always just a call away.

Book a same-day appointment or request a free estimate. Give us a call, and we’ll be happy to help.