Has anyone else out there seen an alarming number of these microwaves with repeated magnetron and inverter failures? Model # GMH5205XVS-0
is just one example but there are many other models made within the past 1-2 years that have this same cavity / waveguide design. Symptoms are no heat or intermittent no heat along with F7 codes. What we are finding is severe arcing in the waveguide. I have attached a picture of the burnt waveguide & magnetron. Other points of arcing are sometimes one of the 3 "posts" that are inside the waveguide. The posts seem to be there to help disperse the microwaves as there is no stirrer fan in these models. The burns in the waveguide can usually be seen without pulling the unit down by removing the waveguide cover inside the cavity & looking up inside it with a mirror & flashlight. Usually you will find fine pieces of burnt metal at the bottom of the waveguide opening when you remove the cover if it has been arcing for a long time.
Because of the burnt waveguide, Whirlpool is having to replace these units when they fail, if they are still under warranty. Unfortunately for the customers, these units only have a 1 year warranty, with no more extended coverage on the magnetron or cavity. So once these things burn up after the first year, the customer will have to buy a new one. Simply replacing the magnetron on these units has resulted in the magnetron burning out quickly again.
I personally have seen 15 - 20 of these microwaves that have burnt up like this over the past 9 months. Other techs in my company are also seeing the same. Whirlpool is refusing to acknowledge that these units have a problem. I think they are hoping the majority of them make it past a year so they are off the hook.
Anyone else seeing these?