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This is the error code for the thermistors not reading the fuser temperature correctly. You can reset the error once and if it comes back the thermistors mostly have to be replaced. Look to see if there is some paper blocking the thermisors getting a good reading. Press the additional Function key and the press the 2 and 8 key at the same time and then the additional function key again. This will get you into the service mode. Press copier, then function, then CLEAR, then ERR, then OK. Turn of the power and power back on. All should be good again. If this error comes back or any other ones with single digits then a tech will have to reair it.
I think the 1180 is close to the 1120 copier I know. The error code is indicating an upper heater open circuit. The fuser is the very left item when the main drawer is pulled opened to remove a paper jam. There are two handle grips front and rear to remove the assembly. You have to check continuity of the heat lamp, fuses, etc.
Pull out fuser unit and remove the top. ( let machine cool down, VERY HOT!!) does the fuser web need replacing ( looks like a white paper towel roll) it has fuse oil on it. is it overflowing?? try cleaning, do not spill on floor it is very slippery and hard to clean up.
k you may have several problems you may take some canned air and blow out the connectors on the tx unit and the inside frame particularly the connectors on the lower right rear frame wall .. when you pull out the tx unit you may also want to turn the two cam gears on the lower left rear frame all the way clockwise then slide unit in