Microwave primo mg4, not heating? if your microwave functions correctly but not heating? then there a few parts to check
1)unplug the microwave from the power line,
2)discharge the capacitor with isolated tools.
3)check the network of HIGH volt parts (transformer, capacitor, fuse, diode, magnetron)
after fixing or while fixing make sure you put the cover back, and avoid any exposure from the MAGNETRON (RADIATIONS)
3)change the broken parts with exactly the same spare parts