Wall Oven : Won't heat
For a gas wall oven that isn't heating, check your gas supply cut-off valve to make sure it's open. A weak or broken igniter can also prevent a gas wall oven from heating. A broken igniter won't glow. A weak igniter will glow but it won't get hot enough to ignite the gas, so the safety gas valve won't open and the oven won't heat. Replace the igniter if it's weak or broken.
In an electric oven, a broken bake or broiler element can prevent the oven from heating. A tripped thermal switch on the back of the oven can also prevent an electric oven from heating. Reset the thermal switch if it tripped. Electric wall ovens require 240 volts of electric power to heat, so one of the two 120-volt house circuit breakers can trip, preventing the wall oven from heating. Check the house circuit breakers for the wall oven and reset a breaker if you find one tripped.
In either a gas or an electric oven with dial controls, a failed oven control thermostat can prevent the oven from heating. For electronically-controlled gas or electric wall ovens that have a digital display, a failed keypad, bad electronic control board or faulty relay control board can prevent the oven from heating.
Reset the wall oven thermal switch or replace the thermal fuse
Many ovens have a thermal switch or a thermal fuse that protects the oven from overheating.
If the oven has a thermal fuse, the fuse trips when the oven temperature gets too hot. You can't reset a thermal fuse so you'll have to replace the fuse if it trips.
You'll also need to investigate the cause of overheating if the oven got extremely hot before the fuse tripped. A stuck relay on the electronic control board can cause the bake or broil element to heat constantly. Check the control board for a burnt spot or melted relay. Replace the control board if damaged.
If the oven has a thermal switch, you can reset the switch by turning off electricity to the oven, removing the exterior back oven panel and pushing the red reset button on the back of the switch. If the switch tripped during the self-clean cycle because excessive residue inside the oven caused the oven to overheat, then you can reset the thermal switch and the oven may work properly. If the thermal switch continues to trip and the oven doesn't overheat, you'll likely need to replace the thermal switch because the switch is tripping at the normal oven operating temperature. If the oven overheats and trips the thermal switch after you reset the thermal switch, then you'll need to investigate the cause of the overheating as described above.
Replace the wall oven igniter
Most gas ovens have a glow-bar oven igniter and a safety gas valve. Those components are connected in a series-type electrical circuit. When the glow-bar oven igniter is hot enough to safely ignite the gas, the safety gas valve opens. Replace the oven igniter if doesn't glow, or if it glows but doesn't get hot enough to open the gas valve. Some ovens have a separate igniter for the bake burner and the broiler burner, which operate on the same principle.
Replace the wall oven control thermostat
The oven thermostat is a temperature-controlled switch that controls heating inside the oven. Replace the thermostat if it doesn't maintain the oven temperature incorrectly, if it fails to turn on to the oven burner to heat the oven, or if it fails to turn off the burner when the oven is at the set temperature.
Replace the wall oven bake or broiler element
In an electric oven, the bake element at the bottom of the oven and the broil element at the top of the oven provide the heat for baking and broiling. Replace them if they're broken or if the oven isn't heating properly.
Replace the wall oven electronic oven control board
The electronic oven control (EOC) board governs the timing and execution of oven functions such as baking and broiling. It's usually in the control console and often has a digital clock on the front of its housing. Replace the electronic control board if it doesn't light up when it's supplied with electrical power, if it doesn't operate properly or doesn't properly send voltage to the bake or broil element (in an electric oven) or burner (in a gas oven).
Replace the wall oven control keypad membrane or overlay
Some oven electronic control boards use a separate membrane keypad that communicates the button selections to the control board through a ribbon wire connection. Replace the membrane keypad if buttons don't work. Other electronic control boards have selection buttons incorporated into the body of the control board, with an overlay that marks the selection buttons. Replace the overlay if it's damaged or discolored.
Replace the wall oven relay control board
Some wall ovens have a relay control board that's separate from electronic control board. The relay board has electrical relays that control voltage going to major loads such as the bake element or a surface element, based on signals from the control board. Replace the relay control board if it fails to properly control voltage to a component.
If the oven won't heat after resetting the thermal switch, replace the thermal switch.
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