I have been noticing a faint burning smell for over 1 week now when heating anything in microwave for more than 1 minute. today it finally stopped heating...I noticed that the fan in back of unit does not run...could that have to do with it not heating or is it the diode, transformer or capacitor? Please help... Karin
The diode would not likely be the cause of the unit not heating. You will want to test the magnetron which should have a resistance reading of less than 1 ohm. If not or reads open then the magnetron is bad and would need to be replaced. You will also want to test the capacitor. When testing the capacitor you should get a reading that drops off. If these check ok then the most likely cause would be a bad transformer.
My 30" Kitchenaid oven blower is excessively noisy. Likely the blower? or is the mounting loose? Is there a history of bearing failures or imbalance in Part Number 4449888 (AP3109908)?
Answer Madcir, Like any motor, the more usage they encounter the noisier they get. In most cases, the fan gets noisy due to mishandling and or improper installation, and this occurrs fairly early in the usage. Your issue is most likely due to age and usage, When you replace the assembly, make sure you use the foam pad(s) and the fan assembly is installed level in both directions and the mounting screws are not overtightenned. Thanks