SOURCE: HELP, H4 ERROR
The fuser isn't heating up on time. You could try turning the copier off for 30 seconds and turing it back on again to see if it goes away.
If it doesn't happen, there is a part that has to be fixed on the fuser to correct the problem. Usually it is the thermistor.
SOURCE: Error code H4 on Sharp AL-1641CS?
Usually a flase code on these models. Try clearing by pressing "C" then far left key (Exposure Mode) then "C" then far left again. Must be pressed quickly and if done correctly display will go blank. Then key in 14 as if making 14 copies. Then press Print.
Short Version: C, far left, C, far left, 14, print
If code returns then you have a fusing unit problem but 9 times out of 10 this is just a false code.
Good Luck
H4 Heat roller low temperature detection
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