I have a Diplomat Oven 900Ga (ADP0320) and I have two problems with it:
It always seems to take a long time to cook anything. For instance if I bake a pizza and follow the cooking instructions to the letter it can take up to double what it says on the instructions. This is with me warming the oven up on GM 9 for 15 mins before turning it back down to the required GM.
Also just recently I have noticed that if you have the grill on low for about 10 – 15 minutes the whole thing cuts out. I have read in the instructions that this is the thermal cut out and this signifies that the cooling fan on the rear is not working. I have checked this and it seems to be working ok.