slef clean oven not hot enuf to clean
 

What would cause my almost 20 year old Caloric oven to not self clean.
I set the dials and oven lock per instructions.
The oven works, but does not get hot enuf.
The safety lock remains engaged for a while after the cycle completes.
But, the oven is not clean.
I was thinking the igniter, but as far as I can tell, both the oven and
broiler setting appear to work properly in normal use.