I have split system aircon model no ese21hra wont

Lift the front cover of the air con, on the right hand side there is a button or a hole which has a button inside which you can press which is for manual starting of the air con. If this works, then you will know the remote is faulty, if it still doesn't work, check that the isolator switch for the air con hasn't been turned off. There will be 9Or should be) a switch outside next to the air con outdoor unit to switch power on / off to the air con. If not, there should be switch inside the meter box at the front of the house. Make sure they are switched on.

Normally in your situation I would call the owner and ask for instructions. You could request the owner to send a technician and get it up as a tenant you cannot be denied use of the aircon if that is part of your lease benefit.
We cannot help you much at fixya.com without knowing the make and model number of the aircon unit. Usually with split systems I could suggest you turn the mains power off at the circuit breaker, wait a few seconds and then turn back on. Then go to the internal unit and with remote control start the unit. See if everything comes back to normal.

see the led bulb of the remote control by using a camera then switch on the remote if it blink the remote is good but if not its bad. dont forget to put an battery on it. then test the ac unit manually, if the unit start replaced your remote control.

Have type R11HG/E remote for split system aircon , batteries went flat in remote , replaced tried to reset but will not temp stuck on 24c , clock o:oo no responce from remote to unit.

Indoor room sensor and coil sensor defective. Replace it.

well check ur batteries in ur remote control unit and replace them with new ones instruction to do this u will find in ur user guide......

lg air cond.multi split led lamp blink power 1 times,good sleep 2 times

check capacitor on outside unit,or gas is leaking.
try to reset(small black button in inside unit under the cover)

On some remotes there is a reset button which is pressed by using the nib of a pen. Or if this does not work you should look under the cover for a manual button, most units have one, and see if the aircon responds. I suspect your remote sensor is faulty, but try the previous suggestions first.