that should be performed by a licensed and experienced air conditioning technician. As our air conditioning is under a limited warranty, you should let us and our HVAC technicians know. If we discover a problem with an ageing or inefficient system that needs repairing, we suggest replacing or repairing the air conditioning system.
By elaborating your issue would help us articulate what kind of service you would need, so we have a better assessment of your case. If the fan blades appear to be off, check that the external condenser and fan motor are working correctly and turn your system on again. If you discovered there is something wrong with your air-con, or you found a broken or damaged fan blade, leave the system on and contact your local HVAC expert.