Open Heat Error Cycle Power on the Samsung ML3051 / 3051ND Printer
Troubleshooting and Repair Tips for the Samsung ML-3051ND and ML-3051 Printer
The Open Heat Error on these printers is caused by an open-circuit in the fusing assembly, Dell / Samsung JC96-04387A / UG297 110V Complete Fuser Assy
Follow the instructions below to remove the fusing assembly and thermostat. Once you have the thermostat out test the continuity across the two parts. If it has continuity  then that’s not the problem. If it doesn’t then measure across the individual thermostats to find which one is open. Once you have isolated the problem child take a can of air and hold it upside down. Now give the front of the thermostat, open in that can be depressed,  a shot of extremely cold air. This should pop it back into place. Test across the thermostat for continuity again. If it has continuity  now, then reinstall it and put the fuser  back in the machine and retest. If the fuser rollers haven’t melted together you should have a working machine again.
If you have continuity across the thermostat then you most likely have a lamp or connection problem. Except for the thermistor  the Fuser  runs on AC power so you should have continuity across the lamps and thermostat. Pretty much a straight path going into and out of the fusing assembly. If you’re getting  an Open Heat Error then something in the fuser  circuitry  is open. It’s up to you to find it. Now if you don’t feel like doing all this testing then your next step is to replace the fusing assembly.
While you have the fuser  out, you should check the condition of the unit. Look for scratches in the hot roller where the thermistor  and pick fingers could have worn away the surface. Check for a warped or wrinkled surface on the pressure roller. Finally check the gears out. Look for gear dust and worn down gear teeth. If you do get the machine functioning check the number of prints on it from printing a system data report. Look to see if it’s around its estimated life of 80,000 prints. If you find any of these problems in the fusing unit from a visual inspection then it’s probably time to replace.
Rear Cover
1. Take out the Duplex Unit.
2. Remove the four screws securing the Rear Cover and then Release the Rear Cover from the Set.
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Dell / Samsung JC96-04387A / UG297 110V Complete Fuser Assy
1. Before you remove the Fuser Assembly, you should remove: – Rear Cover
2. Remove the four screws securing the Fuser  Assembly and then pull the Fuser Assembly.
3. Release the CON Harness and REC Harness from the Thermostat and then remove the three screws securing the Thermostat and remove it.
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