I have a Carrier Visionaire LCA061P air conditioner that my landlord accidently dropped about 3 feet out window.It broke the outside shell, broke the fan and whatever else. Is there a place where I can purchase another one of them? I couldn't find anything online. It's been wonderful because you don't loose half a window when installed. Don't think this can be repaired. Thank you

clean out the drain at the back

6050BTU

Carrier LCA061P 6050 BTU Thru-Wall/Window Air Conditioner

The AC your landlord installed is rated at 8000 btu which is way too small for 900 sq ft. You need at least a 15000 Btu Air conditioner and a 'well insulated' house to be cool.
A good rule of thumb in the AC business says you need 1 ton (12000 btu) of Air conditioning for every 600 sq feet (if the house is well insulated) - if not - then you will need 1 ton (12000 btu) for every 400 sq feet.
So, if you have 900 sq feet and the house is well insulated you should have at least a 15000 btu unit.
If it's not well insulated you will need 24,000 btu.

Something fell from the roof and broke the top (outside) of my
visionair a/c unit. Can I replace the part? It's near the circle on
top and finally part broke away and can't be found

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http://www.nextag.com/carrier-air-filter-expxxfil0016/compare-html

When compressors are on their way out, this is a symptom that is common.

There should be an Error code cheat on the back of the electriacl cover that explains what each blink or sequence means. If it doesnt have one then just go online and look up the Model/Serial number up on the Carrier website and it should tell you.

look in phone book for a company called johnstone most of the time they will sell those kind of parts to general public

Good possibility. WIth the unit powered off and unplugged check the clearance of the wheel and the collection basin underneath, Debris could be the source but I suspect the bearing is failing on the motor

window type airconditioners have a shell or outer body. Install the shell first. "L" braces are okay to use for bracing the protruding condenser outside. Once the shell is secured you can just slide the main airconditioner in it.