Why ac of after working one hour screen show e3

What showing 0 in votls ac

mfr. model no.? some mfr., e3 means low pressure. may need sufficient refrigerant, otherwise suspect the pressure switch.

Try this: http://www.manualslib.com/

I Googled this: Fuji air conditioner E3 Error
One item seems to have the answer:
http://errorcodeairconditioning.blogspot.com/2010/10/fujitsu-air-conditioner-error-codes.html
"E3:00 Return air thermistor short circuit"
So more than likely you have a crossed wire issue. good luck.
I'd call ACND service man!

Split AC Lloyd 3star

e3 error code comes when room not getting cool after 3 hours ac working, pls close all doors and windows and if possible try to run ac in an empty room for 1 hour , then check for fault,

if split ac display shows e3 what is the solution for that problem

all brand a/c's error code plz

yep!
e3 means a machine error and it need a service technician to fix it.
furthermore may i ask what e3 code displays on the screen (you might see something like this e3 10 , e3 40 , e3 01 etc)
i can still help you if it is e3 10
:)