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It sounds like it locked up. Hold the Power Button down for 15 seconds. The machine will power off and allow you to turn it back on.This is not recommended to do all the time - but in your situation it's your best bet.
On a portable a/c unit the cooling is done by taking heat out of the air inside and dispensing it outside.
That's accomplished by washing air over the heat coil in the unit, then the air goes back outside to let the heat out there.
You'll need inlet air, and outlet air to accomplish that.
Inlet air is cooler as it comes in, then that air absorbs some of the heat inside the space you're cooling and turns around to go back out leaching heat outside.
Most likely scenario.
There may be another need for outside air revolving around positive pressure inside the conditioned space.
Let me know if that doesn't solve your situ. Russini
This means the revolver (holds the 3 color toners/developer units) never returned/moved to its "home" position. It could mean a bad or dirty home position sensor or a faulty/bad logic board or possibly a bad motor (not rotating the revolver correctly) try cleaning or replacing this sensor first. if you remove the covers from the left side of the copier you will see the revolver unit. the sensor is located at the rear of the revolver unit mounted on the frame of the copier.(easy to see) there is one screw holding it and a small wire connector. These copiers are "famous" for having dirty sensor issues. If the revolver/machine makes an odd noise when starting up, caused by the revolver then its starting to turn (run the copier with the side cover open so you can watch it) then it would point more to being a drive problem.
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