Tried to wash the grease off one of the fan grills and being unsuccessful with many attempts using different methods, finally tried diluted bleach but it discoloured the metal. I think I have to replace that fan grill but I don't know how to go about ordering it.
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Remove the grill along the bottom of your refrigerator. Locate the drip pan, using a flashlight if necessary. The pan should be sitting on a set of black condenser coils. Remove the pan and wash it. Use a mixture of warm, soapy water and bleach to kill the mold. Reinstall the pan and the grill. Locate the coils. They look like thin, black radiators and may be underneath the fridge or attached to the back. If the coils are on the back, pull the refrigerator away from the wall, then vacuum the dusty coils, using the brush and crevice attachments. Reinstall the refrigerator grill. If the coils are underneath, pull off the grill and remove the drip pan. Vacuum the dusty coils, using the crevice attachment to get between them. Take care not to damage the delicate coils. Reinstall the refrigerator grill.
On the 720 there are two thermal cut outs. Looking at the wiring diagram, the cooling fan and the clock are the only two items that will run independant of the cut outs. So, is the cooling fan running ok or not? If it is and the grill is cutting out, then it could be the thermal cut out that has aged - or the fan may be running slowly because of age or there is a build up of dirt grease under and around the oven and on the outlets that stop air curculating properly.
If the fan isn't running then you need to replace it or the fan timer PCB may have failed. Once you have gotten into the oven's inards, you can test the fan to see if it runs or not.
It sounds like grease has dropped down and clog your burner unit. It should be cleaned and then the flames should be even once again. You would need to use a degreaser to clean the burner unit which is located at the bottom base.
Two problems found. The electrician that installed the micro. installed it incorrectly. The fan was supposed to be turned so that the exhaust would go through the pre-installed duct in the wall. To remove the grill, there is two screws on top of the micro. which have to be removed. The builder put in a deeper cabinet that covers the screws because it looks better. To fix it I have to drop the micro, take off the grill, clean it and all the grease off the micro., replace the charcoal filter, turn the fan so it will exhaust through the duct and reinstall the micro.
Definately the control with 2 lines where the fan kicks in. The grill and oven elements will come on. The fan will disperse the heat from the grill element evenly and more quickly inside the oven. You will need to reduce cooking temperatures by about ten percent though,or youll burn your dinner. Also keep food down ,not too close to grill element at top of oven, middle is fine. Hope this helps. Regards..