How can I clear Error messages fromCanon Imgerunner 2525?

Try this: HOW TO CLEAR ERROR: E000010 FOR Canon imageRUNNER IR2422 - YouTube

Go to service mode find clear - engine - errclr - ok - restart.
Your problem will solve 100%>

if you already replace the fixing unit and clear the error from service mode, maybe the problem is located in the power board assy

First clear that error from service mode. Press additional function
press 2 and then press 8
press additional function again
service mode should appear in screen
select "clear"
select "engine"
select "Errlcr"
select ok.
unplug power cord for a few seconds and restart the machine,
try to make some copies if problem persist replace the fixing heater assembly

clear, interupt, 0, interupt, 14, 1, start button.

Please try to clear the error.Enter service mode by :
press *
press 2
press 8
press *

follow path: COPIER-FUNCTION-CLEAR-ERR and ok, switch off and on.Hope It's resolve all Your Printer Problem,
Or Still having Problem Then follow Us For
Canon Printer Support

reset the error.
pres additional function, 2 , 8 and additional function in clear mode clear err.

VOLTES IS LOW CHEK YOUR POWER SUPLY & VOLTES
THEN
CLEAR ERROR CODE

press counter check
press 28
press counter check
clear data
ok
engine
ok
restart machine
You will get ok
-- jai chandra

Try to turn off and on , or in service mode ( * 2 8 * ) under clear, error clear or clear all, if does not help replace fixing film unit