I need help fax canon B120 error ##331 - Office Equipment & Supplies

the error code ##331, means that the ink level can not be detected it can be a problem of ink level detector; you need to resave your ink level. to resave the ink level: look at this link: http://www.fixya.com/support/r6643185-waste_ink_tank_full_fax_b120_b140_b820 if you need a clarification you have to add a comment to this solution.

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carriage unit faulty

Fax Canon B120

Error code :##342

HI your problem in fixing unit change it and your problem will be solved

....
1.) press function then # u reach SERVICE MODE
2.) arrow right until TEST MODE confirm with Start / Enter (green button)
TEST MODE [1] - [8]
3.) press # ... u reach AMI MODE [1] - [*9]
4.) press 7 ... u reach FACULTY [1] - [6]
5.) press 6 ... .u reach LOST INK CHECK...confirm with green button...
u get [1] - [2]....
6.) press 2 u reach SET LOST INK CNT....confirm with green button...
u get LOST INK = 100 (in my case it was 100 ..this was the error..)
7.) press 0 (the digit zero..) confirm with green button...
8.) wait a few seconds....the unplug and reboot....

this worked in my case....

I did not fix the problem but I found something: http://fax-parts.com/G3%20Service%20Codes.htm

I'm not familiar with the B120, but if you have an L120 the manuals are available here. The Starter Guide will explain receive mode options and setup instructions. The Advanced Guide will provide troubleshooting guidance.

The level of ink cartridge , can not be detected Solution :

1. resave the detection level Ink by entering the service mode
2. replace the ink detector