Error 77 brother 2800 machine error 77

Heater harness disconnected or broken. Or heater thermistor harness
disconnected or broken when the power is turned on, the top cover is
opened and closed, or the machine exits from the sleep mode.
Heater thermistor short-circuited. Or heater thermistor harness disconnected
or broken when the machine is on standby. )

Error #77 refers to a mechanical problem, but I'd say about 7 times out of 10 it's a mistake. Fortunately, Brother fax machines have override commands :). Try this:

1. Turn the power off and unplug the power source.
2. Press and hold the menu button and plug in the power source (don't let go of the menu button!).
3. Hold the menu button for 5 seconds after plugging in the power source.
4. Release the menu button and press "91"
5. If the screen still shows the error code, press "99".

Hopefully this will override the error and you can get back to work :) .

Hope this helps! Good luck!

Hello there, in a situation like this the best thing for you to do is to call Brother customer service at 800-284-4329 and explain the problem.
Thank you

press menu *2864 in quick succesion, it will enter test mode, then exit out of test mode by pressing 99, that hopefully will do it

Heater harness disconnected or broken. Or heater thermistor harness
disconnected or broken when the power is turned on, the top cover is
opened and closed, or the machine exits from the sleep mode.
Heater thermistor short-circuited. Or heater thermistor harness disconnected
or broken when the machine is on standby

Have you tried unplugging the machine, holding down the Menu/Set button while plugging back in. Release Menu button. Enter 91. Enter 99. Machine should say please wait while warming up. Let me know.

You have fuser failure. Replace the fax cause repair isn't worth the cost.

You probably have a bad FUSER unit. Call a Brother Dealer for service.

You have a problem with the FUSER UNIT.

the fuser unit (fixing unit) not registering heat requirement. The heat roller or the thermistor sensor is defective.Remove fuser and check roller, if good replace sensor, reinstall fuser and reset machine.