If the thermostat of your oven is turned on, but you notice that the oven is blowing in cold air, the likely culprit could be the damaged heating element surrounding the fan. Have a technician unplug the cooking appliance and eject the back cover. This will give you a clear view of both the oven and the element.
If the oven is blowing cool air, either you have a stuck relay on your control board or the temperature sensor isn't reading properly. You can't test the board but you can test the sensor. Open the door and remove the 3-4'' long thin metal rod attached to the back wall.
If your circuit breaker hasn't been tripped and your outlet works, the next step is to check the parts of your oven. Use your gas or electric oven owner's manual to check your heating element/igniter, make sure that your oven door is sealing properly and your temperature sensor is located in its proper position.
Calibrating electric ovens with analog controls
Remove the oven temperature knob and turn it over. There should be one or two screws on the back of the knob. If your oven is running hot, turn the screw(s) clockwise. If the oven is running cold, turn the screw(s) counterclockwise.
If your Fan assisted oven is not heating up, the likelihood is that your oven's element and/or thermostat could be faulty.
Cooling Fan
It helps to keep the electronic controls cool during every oven function such as BAKE, BROIL or CLEAN.
Check Furnace Thermostat Settings
Incorrect thermostat settings can be the cause behind no heat coming out of the vents, even with the furnace blower turned on. Check the thermostat to ensure the setting is in HEAT instead of COOL. It is a common mistake that happens. The fan runs continuously when it is switched on.
If your oven is not maintaining the correct temperature, it could be due to a malfunctioning thermostat, a faulty heating element, or a malfunctioning temperature sensor. The issue may also simply be a need for calibration or keeping the door closed.
Place the multimeter on the thermostat. If the thermostat has a reading of zero or as close to zero as possible, it is working fine. However, if it has no reading at all, your oven thermostat is faulty and will need replacing.
Common Causes
Defective electric oven thermostat. Faulty electric oven element. Broken gas oven thermostat. Damaged gas oven burner or ignition electrode.
The most apparent signs the heating element is broken are visible damages. Take time to check your oven and remove the heating element to inspect it thoroughly. While you're at it, be on the lookout for burns, blistering, or cracks. If you notice one or some of these signs, it's time to have it replaced.
Average oven and stove repair cost
An oven igniter replacement costs $150 to $325. The cost to replace a heating element in an oven is $150 to $450. The cost to get an oven fixed is $50 to $125 per hour for labor. *Cost data is from research and project costs reported by HomeGuide members.
Turn the circuit breaker to the OFF position or remove the fuse. Wait one minute, then turn the circuit breaker back to the ON position or install the fuse to reset power to the appliance. This should reset the electronic controls on the Range or Wall Oven.
Issues with the thermostat, selector switch, or heating element can hinder the oven's heating ability. Additionally, ensuring the gas supply line is intact and not obstructed, if you have a gas oven, is essential for proper heating. If problems persist, seek professional assistance for a thorough inspection and repair.
The heat exchanger uses coils to transfer heat from the ignited gas to the air. When cold air blows from a furnace the heat exchanger, furnace burner, or exhaust are likely the cause. This may be due to dirty components, broken parts, or the many safety mechanisms within the gas system.
Turn on the oven to 400 degrees, then watch each heating element for a couple of minutes. If they glow red, they're working. If one doesn't, or if you notice signs of blistering, separating, or cracking, the heating element should be replaced.
Remove the oven temperature knob and turn it over. It should have one or two screws on the back. If the oven is running cold, you will want to turn the screws counterclockwise, and if it is running hot, you will want to turn them clockwise. Turn them gradually, about an eighth of a turn each time.
On average, replacing a new thermostat cost ranges from $100 to $300. However, the price of a thermostat can vary widely depending on several factors. The type of oven is one of the primary factors that determine the cost of replacing thermostat in an oven.
Experiencing an Oven Heating Element Failure
This will cause the sheath to rupture and sparks may occur for a few seconds. At this point, one of two situations may result: The household fuses or circuit breakers may "blow" or trip. The heating element will stop working.
Then you can simply remove the thermostat from the control panel. Finally, to replace your oven thermostat, just do the opposite of what you have just done - fix it to your control panel; rewire it; feed the wire through and fit the capillary tube back into the oven cavity, and fix everything back together.
Typically, with this issue, the only way to stop the oven from heating is to unplug it or turn it off in the electrical panel (breaker box). The most common causes of the issue are a fault with the control board or a damaged heating element.
In most cases, if your fan oven is not heating up the problem will turn out to be that your fan oven element is faulty. However, instead of replacing the entire cooker, you can easily replace the oven element and save yourself a bit of money - which is always a good thing!
Clogged Air Filter
Dirty air filters are another common cause of many HVAC problems—including blowing cold air when the heat is on.
If the thermostat is faulty, it may not send the proper signals to the fan, preventing it from turning on or functioning at the desired speed. A bad thermostat can also cause the fan to run continuously or not turn off when it should.