Oven will not hold temp! Already tried Control Board & Sensor! Now what?

Oven/Range/Cooktop Repair
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1

Our oven will not keep temp. We installed a new control board 2 nights ago and thought we had it fixed. It help a 450 temp for 45mins! Then the last night we tried to bake something at 350 and it reaches temp, holds it for 15-20 mins, and then goes down to 150! We keep hearing it lighting up and then a few mins later it will stop (back and forth). So we then installed the sensor - NO LUCK! Oh we have already tried adjusting the temp using the control board like it describes in the manual that doesn’t work either.

We are now thinking the spark module possibly?
Any help would be great!!! Thanks!

2

The first thing I would do is check the Bake burner. If it has just four holes at the igniter tip then replace the burner assembly.

If it has eight holes (as you can see on the picture attached to the reply) then take a drill bit one size bigger then existing holes and enlarge them.

Here are the break down diagrams for the Whirlpool range Model SF357PEKQ0

Gene.
Burner.jpg (8.7 KB)