Lou J. for Model Number PEM31SM3SS Hello, Not too long ago I noticed that there was a burning smell coming from my microwave. We tend to only use it for short periods of time (30 seconds to 2 minutes) and we noticed it was taking less and less time for the smell to be obvious. I looked around and found some discussions that implied that the rectifier was the most likely culprit. I ordered one and replaced it with the new one, but while things were open, I did test both rectifiers with a meter and a battery and saw that they both tested the same way. That was an indication that perhaps the old rectifier was not bad, but I left the new one installed anyway. While things were open, I searched for the source of the burning smell and it was clearly one of the connectors on the transformer wires that was burning and melting. I ensured both connectors were seated properly when I re-assembled the microwave, and when I began using the microwave there was no smell at all! I felt very smart and thought all was great, but then about a week later, the smell is back within just a few seconds. So, clearly the rectifier was not the problem. I'd like to assume it was the transformer, but could there be something else that is causing these items to overheat or the transformer to malfunction? Please help, my coffee is too cold to drink! Lou
Answer Hello Lou. It sounds like you will need to replace the transformer and replace the terminals on the wires that are burnt in the unit as well. Read More... Answered by AppliancePartsPros.com | Saturday, February 23, 2013