I'm sure it's not the answer you're looking for but the "Open Heat" error is related to the printer's fuser, switch mode power supply or temperature control thermistor. More than likely it's the fuser which needs replacing and you'd need to contact Dell for a replacement. If you google for "1600n fuser" you'll also come up with several retailers with fusers in the $80 range as opposed to Dell's $140+.
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