it acts like it's finished pre-heating, control will still show temp but when you open the oven they find it only warm not at specified temp.
When I replaced the upper oven control board I put it on bake at about 400, stayed for about 20 minutes to ensure it worked. Evaluated temps while it preheated and then watched it cycle off and on to ensure relays were firing once at desired temp. All seemed to work and I thought we had it fixed. Customer called yesterday to state its not working again. I'm ordering a new bake element to take with me just in case bake elem. is out. But I'm guessing at this point. A new main control is $400 so I don't want to go that route unless I'm a little more sure.