Appliance tip of the week...

Oven Won't Heat

The part(s) or condition(s) listed below for the symptom Oven won't heat are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Igniter

The igniter is the most commonly defective part for an oven not heating. The igniter has two main functions. First, the igniter draws electrical current through the gas valve to open it. Second, the igniter glows to ignite the gas in the burner assembly. If the igniter is defective, it will fail to open the gas valve. If the gas valve does not open, the oven will not heat. To determine if the igniter is defective, observe the igniter as the oven is heating. If the igniter glows for more than 90 seconds without igniting the gas flame, this indicates that the igniter is too weak to open the valve. If the igniter is weak, replace it. If the igniter does not glow at all, use a multimeter to test the igniter for continuity. If the igniter does not have continuity, replace it.

Bake Element

When the bake element is heating properly, it glows red hot. If the element does not glow red, this indicates that the element is not heating. Often, if the heating element has burned out, it will be visibly damaged. Inspect the heating element for holes or blisters. To determine if the bake element has burned out, use a multimeter to test the element for continuity. If the bake element does not have continuity, replace it.

Broil Element

Inspect the broil element for holes or blisters. When the broil element is heating properly, it glows red hot. If the element does not glow red, this indicates that the element is not heating. Often, if the broil element has burned out, it will be visibly damaged. To determine if the broil element has burned out, use a multimeter to test the element for continuity. If the broil element does not have continuity, replace it.

Incoming Power Problem

It is possible that the oven is not receiving proper voltage. Electric ovens require 220 volts of alternating current. If the oven is receiving significantly less voltage, it won?t heat. To determine if the electrical outlet has sufficient voltage, use a multimeter to test the incoming power at the wall socket.

Thermal Fuse

If the oven gets too hot, the thermal fuse trips to shut off power to the oven. If the thermal fuse has blown, the oven will not heat. However, this is not a common occurrence. To determine if the thermal fuse is at fault, use a multimeter to test the fuse for continuity. If the thermal fuse does not have continuity, replace it. The thermal fuse cannot be reset?if the fuse has blown, it must be replaced.

Oven Control Board

The oven control board has relays that send voltage to the bake and broil circuits according to the user settings and sensor input. If the control board is defective, it may not send voltage to the heating components. However, this is rarely the case. Before replacing the control board, first test all of the heating components. If you determine that all of the heating components are working properly, replace the oven control board. Since it?s not easy to test the oven control board, you will have to replace the control board if you suspect it is defective.

Loose or Burnt Wire Connection

One of the wires that supply power to the bake element might be burned out. These wires commonly burn out near the heating element. To determine if a wire has burned out, inspect the wires leading to the element. If a wire is burned out, it will often be visibly burnt.

Relay Board

Some ovens are equipped with a relay board. The relay board has several relays which control the electrical current to the heating element. If one or more of the relays on the relay board has failed, the oven won?t heat. If the relay board is defective, replace it.

Safety Valve

The safety valve works with the oven igniter to provide gas to the burner. If the safety valve fails, the oven won?t heat. However, this is rarely the cause. Before replacing the safety valve, first test all of the more commonly defective oven components, particularly the igniter. If all of the other heating components are working properly, use a multimeter to test the safety valve for continuity. If the safety valve does not have continuity, replace it.

Valve and Pressure Regulator

The valve and pressure regulator might be at fault. However, this is almost never the case. The valve and pressure regulator is frequently misdiagnosed?before replacing the valve and pressure regulator, first check all the more commonly defective parts.

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