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I see the remote is a wireless one. It may need to be "paired" with the A.C. This is often done by holding down a button on the remote whilst powering up the controlled device.
You'll need to check your manual or contact Hitachi to be certain.
Did you figure out why the ac wasn't responding to the remote? I am having the same problem. I just cleaned out the filters but it's still not responding to the remote. I have already tried reset button in the remote, which didn't help. I am pretty sure that the remote is not out of battery.
Without a model number I can not do much leg work for you. But you can email them direct here [email protected]
This link may also prove to be of some help getting the documents that you need. http://www.hitachi.us/Apps/hitachicom/content.jsp?page=Inverters/Support/index.html&level=2§ion=Inverters&parent=Support&nav=left&path=jsp/hitachi/forbus/powerequipmentsystems/
if the freon is 410a the pressure must be 100-120psi,if it is 22 the pressure must be 45-55psi.you unlucky because hitachi havent problems with compressors.is it inverter the unit?if it is you must check the outdoor pc board,if the 4valve clicking in the you must replaced it propably has stucked.