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Bosch Oven Won't Turn on

The 12 most common part(s) or condition(s) which contribute to the symptom Oven won't turn on 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.


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For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Bake Element

If the oven won't turn on, 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 won't turn on the bake element may have burned out. It is often obvious to see where the bake element has shorted out because there will be a hole or break in the element. If the bake element has burnt out or shorted it should be replaced.

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Oven Igniter

Even though the oven igniter may be glowing, it may be too weak to allow the gas valve to open. If the oven won't turn on and the oven igniter glows for more than 90 seconds without igniting the gas flame, the oven igniter should be replaced. This is the most common part that fails when the oven won't turn on.

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Broil Element

If the oven won't turn on, 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. If the oven won't turn on the broil element may have burned out and caused something else to short 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.

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Other Causes and Conditions

Incoming Power Problem

Although not as common, if the oven won't turn on it is possible that the appliance is not receiving proper voltage. Electric ovens require 220 volts of alternating current. If for some reason the appliance is receiving significantly less, the oven won't turn on. Check for proper voltage using a volt meter at the socket where the appliance plugs in.

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Oven Control Board

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 turn on 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 turn on, first test the simpler components in the circuit. If no power is present at the proper terminals on the control board, the control board will need to be replaced.

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Thermal Fuse

Although not as common, if the oven won't turn on the thermal fuse may have blown. The thermal fuse is designed to protect the appliance and help to prevent a fire. If the oven gets too hot, this fuse trips. The thermal fuse is not resettable and will have to be replaced. It can be checked for continuity. If it has continuity, it's OK. Not all ovens have a thermal fuse.

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Other Causes and Conditions

Loose or Burnt Wire Connection

If the oven won't turn on, there might be a burnt wire supplying power to the bake element. Sometimes the wire supplying power to the element burns out right near the element itself. Check for this by just looking at the wires leading to the element. If they're burned out it is usually easy to spot.

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Relay Board

If the oven won't turn on and the appliance is equipped with an oven relay board, one of the relays on the board may have failed. Normally the oven relays are located on the main clock control board and not on a separate oven relay board. If the oven won't turn on it is more likely that the cause is one of the more common problems listed for the model. If the other, more common problems have been checked and Your oven has a relay board, it may need to be replaced. Oven relay boards are not repairable.

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Oven Thermostat

If the oven won't turn on, the oven thermostat might be defective. Although this is not as common as other components, the oven thermostat sometimes fails completely and does not allow current to pass through. After checking other, more common components, consider replacing the oven thermostat.

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Heat Selector Switch

If the oven won't turn on, be sure the heat selector switch is set to the right position. The heat selector switch completes the circuit to either send voltage to the bake or broil circuit. If the oven won't turn on, the heat selector switch might also be defective, although this is not very common. The heat selector switch is not repairable, if it is defective it will need to be replaced.

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Oven Safety Valve

The oven safety valve works with the oven igniter to provide gas to the burner. If the oven won't turn on it is possible that the oven safety valve is defective. However, this is very rare. Most often, the oven igniter is too weak to allow the oven safety valve to open. If the oven won't turn on, check the igniter first.

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Oven Valve and Pressure Regulator

If the gas oven won't turn on the oven valve and pressure regulator might be at fault. This is not common. Very often people misdiagnose a defective oven valve and pressure regulator when the oven won't turn on However, this is almost never the cause. Look at other, more common components before replacing these.

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