The 8 most common part(s) or condition(s) which contribute to the symptom Oven doesn't bake evenly are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.
For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.
If the oven doesn't bake evenly, check the bake element. The bake element is a black tube near the bottom of the oven about as thick as a pencil. When it is operating normally, the bake element will glow red hot. If the oven doesn't bake evenly, the bake element may have burned out. It is often obvious to see where the bake element has burned out because there will be a hole in the element or blisters on the outside of the element. Test the bake element using an Ohm meter. If it has continuity it's OK. If not, it should be replaced.
As the oven igniter weakens over time, it will take longer for the gas valve to open. If the oven doesn't bake evenly, it may be that the oven igniter isn't opening the gas valve when it should. This will cause the oven to cool down more than it should before the burner reignites. The oven temperature should not cool by more than 40 degrees before the oven igniter relights the burner.
The oven control board has a set of relays that turn on and off power to the bake and broil circuits according to the customer settings and sensor input. If the oven won't heat the problem is usually with the heating components. However, if the oven control board is bad, it might not send voltage to the heating components. To determine why the oven won't heat, first test the simpler components in the circuit. The oven control board can't be tested easily and will have to be replaced if it is defective.
If the oven doesn't bake evenly, check the broil element. The broil element is a black tube near the top of the oven about as thick as a pencil. When it is operating normally, the broil element will glow red hot. In most ovens the broil element comes on during pre-heat. If the oven doesn't bake evenly, the broil element may have burned out. It is often obvious to see where the broil element has burned out because there will be a hole in the element or blisters on the outside of the element. Test the broil element using an Ohm meter. If it has continuity it's OK. If not, it should be replaced.
The oven thermostat has a thin copper tube attached to a slightly thicker tube which sticks into the oven. Inside this tube is a type of hydraulic fluid. As the temperature in the oven rises the fluid expands which puts pressure on a small activator inside the thermostat and shuts off the heat. As the oven cools, the pressure reduces and the activator allows the oven to heat. If the oven doesn't bake evenly it could be that the thermostat activator is broken, or that the calibration has changed. The solution is to replace the oven thermostat.
If the oven doesn't bake evenly the oven sensor might be defective. The oven sensor works in conjunction with the oven control board - or clock - to regulate the temperature. The oven sensor is a simple electronic device which varies its resistance to electrical current as the temperature varies. If the oven doesn't bake evenly, this oven sensor resistance might be incorrect. For small variations, often there is a calibration feature at the control board. On many models there is a certain pattern of pushing buttons in order to calibrate the control board to the oven sensor resistance. Check the owners manual for more information.
If the oven doesn't bake evenly during convection bake, the convection element might be burned out. The convection element is located near the convection fan and helps to heat the air circulating inside the oven. The convection element can be tested for continuity by using an Ohm meter. If the convection element is burned out it will need to be replaced. Because this element is supplemental, if the oven doesn't bake evenly there might be a problem with one of the other heating elements.
If the oven doesn't bake evenly during convection bake, the convection motor might be defective. The convection motor drives the convection fan and circulates the air inside the oven. The convection motor can be tested for continuity by using an Ohm meter. If the motor shaft doesn't turn freely the motor bearings are probably bad. If the convection motor is burned out or it won't turn freely it will need to be replaced.