On Fri, 30 Oct 2020 19:17:32 -0000, "Brian Gaff \(Sofa\)"
wrote:

Not really as in a pure Microwave its the microwaves that heat the food, in
a convection oven you can, assumedly, just use that part with no microwave
in the mix. These tend to use normal elements and a fan!

Sounds like it might be a control board issue. One assumes the display is
still telling you all is well etc?
I guess the parts probably have protection for each device. On the
Microwave side its normally a diode that goes and trips the fuse. I'm
assuming it no longer hums loudly when microwave is used? It would seem odd
if the convection oven was on the same fuse, but I guess it could be, which
would shut both off, and you would need to find out which one is the fault.
Did the element short or did the microwave psu die?
Strange that the other heating element is separate though..
Brian

Thanks Brian, but I capitulated.