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How do range (oven) ignitors (igniters) work?

Range and oven (stove) ignitors DO NOT work the same as dryer igniters. Range / oven ignitors (igniters) use a bi-metal to flex open the oven safety valve allowing gas to flow to the oven burner. On oven safety valves the bi-metal is sealed within the valve and consist of two pieces of dissimilar metals that when heated by the current flow of the ignitor move or flex a specific amount lifting open the port that allows gas to flow to the burner. Oven igniters (ignitors) are matched to the current draw of the oven safety valve.

One common symptom of a bad oven ignitor (igniter) is slow or delayed ignition, sometimes producing a poof sound. And don’t be fooled into thinking the igniter is good because it is glowing red. As ignitors age they tend to increase in electrical resistance. The increased resistance will reduce the current flow in the circuit preventing the bi-metal in the safety valve from flexing enough to permit gas to flow to the burner.

Technicians use amp probes to measure the current flow through the igniter to determine if it is within the oven safety valve amperage rating range.

For the most part if your oven is not heating and everything else works, the odds are the igniter is defective, especially if it is glowing red. We are assuming that this is not a new installation and the range has been working in the current location.