I've had a read around and not come across this problem so thought I'd ask
Wondering if I've killed my flash head filament.
Aperlite YH-700C when attached to the Hot Shoe was working fine then just simply stopped firing, the flash still talks to the camera (Canon 500D) and vice versa even the DOF preview works when you half press the shutter button. If I try to test fire the flash I get three beeps which means flash charging but the led is red which means ready to fire. There are no low battery indicators showing (and I've put fresh fully charged batteries in)
I'm at a loss and thinking I've burnt the filament out I've not been using the flash on full power or strobing.
Hoping someone may have an idea other than its broke mate as i've only used it for about 20 or so shots.