What do I do if there is no display indication and the cryostat doesn’t work FAQ Report Check that the mains lead is connected properly to the outlet and the instrument. Check to see if the over-current (GFCI) or circuit breaker has been activated. Reset and switch the cryostat on again with the mains power switch after approximately 5 minutes. Check the mains fuse. If all of the above are OK – call Technical Service.