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Clean filter,make sure no leaves or other debris is in outside of unit.If the sounds are not of this type, there may be some moisture in the system.(this would make groan or squish type sound) and would require service by a AC tech (to replace the dryer perhaps)
The only service ports that you are likely to find would be on the unit itself on the roof. I would imagine you'll probably have to open an axcess panel on the unit to get to these.
As far as what kind of refrigerant is in these usually that same axcess plate will tell you. I couldn't tell you right off hand but usually its r-410a or r-407c. Occasionally you'll find one with r-22 but again it's up to the manufacturer.
But before you decide to try adding refrigerant keep in mind that legally this should only be done by a qualified service person. Not to mention that there could be a host of electrical or mechanical causes for this. Adding freon is not always, and most typically never is, the problem.
Yes this could be caused by low freon but again, if that's the case then it is most likely leaking and will need to have the leak repaired. This could also be caused by, but not limited to: - a bad thermostat - a bad relay - a bad compressor - a malfunctioning expansion valve
In summary I would highly recommend not trying to do this one yourself without the proper tools. You may very well end up causing more damage than you solve.
You can either ring Hitachi service number and they should be able to tell what the error is or if it is new and you had it installed by a licensed person. Call the person who installed it, as it should be under warranty by them.
Remote control unit are not working. I would like to buy one remote control. I live in dhaka, Bangladesh so how can I buy it? Model No: AR-JE11 for General AC 1.5 Ton Window type. My AC is working by manual on and off.