I have a Canon D780 and I am getting Error E000

SOURCE: How to correct an error E000?

Try the following:
1) Press Additional Functions
2) Press # to enter the service menu
3) Scroll over to select "#12 Clear" and press Set
4) Scroll over to select either "ERR" or "ALL" and press Set
5) The LCD should report "CLEAR OK". Cycle power on the device.

If the error returns the device may need service.

SOURCE: System error E000

E000 is a high temp. error. My first advice would be to atempt to clear it in service mode:

1. Press ADDITIONAL FUNCTIONS, #
2. Go to #7 Printer and press OK
3. Go to #4 Printer Reset and press OK
4. Yes = ( * )
5. Power cycle unit.

If this does not help, on most units you have to start looking at your Fixing Assy. or Thermistors. Make sure that you do not have a piece of paper wrapped around Upper Fixing Roller or and other foreign substance in that area. However, on this one, I would recomend replacing Fix Assy. as a whole if you can, FG6-8326-000 (for s/n starting with MQT/MQV/MRV/MRW) or FG6-8325-000 (for all other s/n). Don't see p/n for Thermistors. Also, heard of alot of other board and p/s issues with this model that can cause E001-E004 errors. See if you can clear it first. Good luck. Let me know how you make out.

SOURCE: Canon fax L160 error E000

you must change the finxing film unit.and then do a clear all.

SOURCE: System error E000

Press the "additional Function" key

Press the # key

Press F3 key until "Printer" shows up.

Press "OK" key

Press F3 key until "Printer Reset shows up

Press "OK" key

Press the * (star) key

Turn printer OFF then back ON

SOURCE: System error E000

Here's the definitive reset. It will work on the following models: ImageRunner 1200/1300, PC1060/1061/1080F, ImageClass D620/D660/D661/D680/D681
Press Additional Functions key
Press #
Press > to #7 Printer Function
Press Set
Press > to #4 Printer Reset
Press Set
Press <
Unplug printer and repower it.