Hi I have a DeLonghi wall oven model: DMFPSII (F6ET) After removing it from the wall enclosure I removed the front panel to clean the screen which had become full of small black ants this went ok. Put it back together and everything seemed OK until I was trying to cook some potatoes at 180c It will only heat up to about 100c. I used the grill element to finish cooking. What do you think is wrong with it? Does it have fuses mounted on it?