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The H4 code indicates the fuser may have blown the thermistor. It also could be a false error code. Try this series to clear the error and if it returns, then you'll know for sure the fuser is the culprit.
To reset press the following buttons:
We had this problem when the power was fluctuating in our building. I called Sharp and they told me to clear this condition with the following code: #*C* and when the screen shows 00-00 enter 14 and press the green copy buton. This worked on the AL-1655CS. On the AL-1631 we had to do a similar thing: C<auto>C<auto> 14 <copy>