IFB microwave going on and off
IFB microwave , when switched on(mains switch wall plug) both timer panel and inside light immediately start going on off, on off - with a clack clack sound coming from somewhere next to the magnetron unit. Timer panel doesn’t work. Initially I thought it was sparking due to dirty wave guide, but it is clean, and fault still there even without the wave guide in place. Anybody any idea? Thanks in advance.