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what does h4 mean on my sharp printer?

my printer is flashing h4 what does that mean and how can i fix it
eric, November 2009
CHECK THE FUSER NOT THE FUSE

SUPERMOUNI, February 2010
abnormal low fixing temperature recorded by fuser thermistor during warm up period

Teddy E Annan, November 2009
link Click here to see other fixes for Sharp.