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'Bakeout' is a procedure where the Extreme ultraviolet Imaging Telescope (EIT) on board SOHO is taken offline in order to maintain the performance of the instrument.
If the images shown on ESA’s ‘The Sun now’ web page display the message 'CCD BAKEOUT', then this means EIT images are temporarily unavailable. In this case, there is nothing wrong with SOHO's EIT instrument. The images will resume within 2-3 weeks.
To keep the ‘readout noise’ down (i.e. suppress the ‘snow’) and also to prevent cosmic ray hits from permanently damaging the detector, the EIT CCD is usually operated at a temperature of about -67 °C. This very low temperature is achieved by keeping the CCD chip in thermal contact with a titanium ‘cold finger’ that is attached to a radiator plate.
Bakeouts are scheduled during periods when data loss is expected, for example during telemetry ‘keyholes’ (periods when SOHO is in limited contact with Earth)
If we sent a manned mission somewhere and it experienced a telemetry keyhole, you could bet your bottom dollar they wouldn't have to wait 2 - 3 weeks to reestablish communications...