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low heat error means the temp. of fusser assy. was not achieved during the specified time. some times occur during low voltage supply and reset after s/w OFF-ON.
Open heat error means there is no electrical connection to the heater heater of the fusser assy. It has tob either repaired or replaced with new one. mostly the thermostat is responsible.
Open the system, unplug the transformer, disconnect one lead of your battery, reconnect the battery first, then the Ac if it says low battery still, then you need a new battery take the one you have go to battery plus get a new one, and reconnect it, it may still say low battery, wait for an hour for the battery to charge, disconnect the AC and battery again, reconnect the battery first then the transformer. It should clear the low battery.That battery is a 6 VDC 1,.9 Ah.
On this machine, you may have a fuser assembly that is bad. Replace the fuser modual.
If this doesnt work, then the main board needs to be replaced.
Also what most people forget is the fuser fan. Sometimes it turns slow and you will not even notice it. It might not even turn at all.
Replacing the fan will solve most problems, but if it still does not turn on, Look on there to see if it has a small circuit board on the fuser fan, replace it too.
if all else fails the main board needs to be replaced.
Motor Control Unit (MCU)
Heat Sink Thermal Trip
If the thermal protector on the MCU heat sink gets too hot, it will open
the thermal protector on the heat sink which will stop motor functions
and an “F/10” will be displayed.
1. Check for proper installation, verify the unit is not located
near a source of heat and has proper ventilation.
2. Unplug washer or disconnect power.
3. Check wire harness connections to the MCU, the motor,
and Central Control Unit (CCU).
4. Check the drive system for any worn or failed components.
5. Plug in washer or reconnect power.
6. Check the MCU by looking for operations of the drive motor.
7. Check the drive motor for powered rotations.
You will need to replace the fuser. There is a fillimant type heater in the fuser roller that goes bad.
Google a business called "The Parts Drop".
They will have what you need. It is very easy to change. All you need is a phillips screw driver.
You open the right side door as if you were removing a jam. You will see 4 silver phillips screws, one with a thin plastic cover . Remove those 4 screws, unplug the one plug, slide the new one in and plug it in. It will warm up and be ready. I looked it up, the fuser is $160 and should be good for 40 thousand pages or more.