@davie77 Err 30 seems to be vry common problem with this model
'''Description''': A malfunction with the shutter has been detected.
'''Resolution''': Turn the power off, then remove and re-install the battery. Then turn the power on again.
Other than that it sounds like a either a stuck or failed shutter. You could call Canon support for your place of residence and see if this is still covered under a “recall” that was happening a while back.