If you turn on your oven and it doesn't heat up, there are a couple of things you can check before calling a repair service.
The first thing to check is the circuit breaker feeding the oven. Since this is a gas oven, it will be connected to a circuit with a standard 15- or 20-amp breaker, not a large double-pole (usually 50-amp) breaker like electric ovens have. Your oven may have its own breaker, or it may be tied into one of the small appliance or kitchen receptacle (outlet) circuits with a common breaker. If the breaker serving the oven has not tripped, the next thing to check is the igniter.
Checking the Igniter on a Gas Oven
The problem could be that your oven igniter has simply gone bad. When the oven control is turned to bake, the igniter turns on and starts to glow bright orange when it is working properly. After the igniter gets hot, the gas valve opens and sends gas through the burner. The igniter lights the gas coming from the burner and the oven begins to heat.
If, however, the igniter doesn't glow hot enough, the oven will not light, and you'll likely smell a little gas. Don't worry though; the gas valve is equipped with a safety mechanism that shuts off the gas if the igniter isn't working properly.
To check the igniter, turn off the circuit breaker to the oven, then confirm the power is off by making sure the oven light, clock, and any other electrical functions are not working. Remove the oven racks and the large metal plate (there may be more than one) at the bottom of the oven. This should expose the gas burner and igniter. Inspect the igniter for discoloration on the coil or element that is different from the rest of the igniter. This is sometimes a sign of a failed or failing igniter.
If the igniter looks okay, you can turn the power back, set the oven to heat, and observe the igniter at the beginning of the heating cycle. It should glow a bright orange within a few seconds. If it does not, and the gas does not ignite quickly, turn off the oven to stop the ignition function. The igniter has failed the test.
Replacing a Gas Oven Igniter
It's easy enough to replace an oven igniter if you understand the process. Shut off the power before doing any work on the oven, and be careful not to touch the igniter coil. Sometimes, these are black-colored spring-like coils; other times they are flat prong-like loops extending from the base of the igniter. The coil is very fragile, and oil from your hands is getting on it can shorten the lifespan of the igniter.
Before you can replace the igniter, you'll have to order a replacement for the defective one. Not all igniters are the same. In fact, they are pretty much all different and have different electrical connections. The only way to get the right replacement part is to start with the oven's model number and serial number. This may be on the back of the unit, inside the door or drawer, or even on a card or tab that slides out from behind the control panel of the oven.
With your model and serial numbers in hand, you can search online for a replacement part, or call or visit a local appliance parts supplier. You can also contact the oven manufacturer online or by phone. Install the new igniter in the same way as the old one.