It looks like an "=" sign with an arrow in the middle
SOURCE: Sharp AR C160 - Error H4-00
The thermistor inside of the fuser needs to be reset before you can clear the code. If you remove the top cover of the fuser the thermistor is located on top of the upper fusser roller. It should be reset able by pushing in. Then you put in the reset code. you may want a tech to look into what caused this.
Hope that helps...
Lbcoaster
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