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The fuser error would most likely have not much to do with the blue piece that broke off - which is probably one of the snaps that hold the fuser or the fuser cover in place, or maybe (if it is pointed or wedge-shaped at one end) a separation pawl.
But neither of those would produce a Low Heat Error. That's a different matter.
The usual thing to do about a low heat error (the fuser is, you know, supposed to heat up a lot, in order to 'melt' the fine powdery toner dust when the paper with toner on it passes through it, and make the toner bind to the paper...) the usual thing to do is to replace the fuser.
That covers all of several possible causes of the problem, and also is rather easier to do.
So, would you like to replace the fuser in your printer as a unit? if so, one can be had here:
for a low price of about $90, or you could buy this one (new):
for about $124, or from here:
for a completely representative $134. (Before shipping and tax of course.)
That would cure the problem with the piece that broke off, too, you know, if the fuser were replaced.
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