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As the oven igniter weakens over time, it
will take longer for the gas valve to open. If the oven doesn't bake
evenly, it may be that the oven igniter isn't opening the gas valve when
it should. This will cause the oven to cool down more than it should
before the burner reignites. The oven temperature should not cool by
more than 40 degrees before the oven igniter relights the burner.
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 heat 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 heat, first test the simpler
components in the circuit. The oven control board can't be tested
easily and will have to be replaced if it is defective.
Sounds like you have a bad oven ignitor and oven burner tube. install a Amperage meter on one of the oven ignitor wire, It should draw above 3 AMPS, if it is below then you have a bad oven ignitor, or just change the oven ignitor to see if it makes any difference. Have fun.
By the parts diagram, it looks like you have a glow coil type igniter . Generally when the oven wont keep temperature, the igniter is failing to reignite the burner. The burner comes on till it reaches temp then shuts off until the temp falls below a certain temp then comes back on until it reaches temp again and so on and so forth. Most of the time the igniter has a very small crack in it and doesn't begin to fail until it cycles several times. I would check the igniter and the safety valves and coils on the valve
this one is hands on fix,many times the spark ignition the one that makes the clicking noise is clicking on a different position,so you most look inside the oven to see the spark, you can see it better at night or when is dark to see the spark, that spark is right at the tip of the oven pilot, make sure you see the spark lighting the pilot.as long as the pilot does not ignite.the clicking sounds continues making the noise. if the pilot lights the noise will stop, if the oven burner does not light after pilot is being for about 1 minute and a half the safety valve needs replacing
The first problem - I am not sure this is a problem - it is normal for ovens during cooking to cycling on or off several times. Is this something you notice recently or this is the first time you have ever noticed this.
The second - this may be happenning because the microswitch at the knob may be deffective (constantly on) check this and the wiring harness to make sure nothing is shorting out