THE LOW DOWN ON ELECTRIC IGNITORS:

Electric igniters use a 110 volt nicrome resistance wire encased in a high tempurature ceramic insulator that is prone to damage by physical shock or bending of the steel tube that surrounds the ceramic.

What happens is that the ceramic cracks & while the ignitor will still continue to function, the crack widens until eventually the nicrome wire touches the outside steel tube making a short to ground. This causes vastly increased current flow which burns out the nicrome wire leaving you with a open circuit.

The life of your ignitor is the condition of the ceramic insulator inside the steel tube & the condition of the ceramic is weather the ignitor steel tube was ever bent, or dropped or hit or bumped into,
either before or after installation. Subjected to any physical shock thqt might crack the ceramic.

The ceramic insulation also has a upper temperature limit ,over which it will not withstand more heat. This is determined by the grade of ceramic insulation and the length of “ON”
time of the ignitor.

The length of on time is determined by the computer control board of the stove & I am sure that stove mfg know how long a “on” cycle they can have without premature breakdown of the
ceramic insulator inside the ignitor.

I used to repair electric stoves for a living, so it is not a new question for me.

4 burner rings, & a bake & broil element , so looking sideways at it, you might say that
an electric range has 6- 240 vac ignitors that it uses to cook with & a pellet stove has 1 – 120 vac burner ring that it uses for ignition.