What is f3, meaning? in carrier 5tr.ductable ac?

Remote as in 'remote control'? Change the internal batteries.

Cut power to the AC and clean the filters. Power back up.

Always include FULL 'make model (what it is)' please.

https://www.google.com/search?q=ductable+ac+remote

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https://www.youtube.com/watch?v=wnKWmtHgEZ4 this is the error list for carrier

Voltas ductable 8.5 Indore erarr odu

L1 Erorr answar send me Ductable unit carrier

Bluestar ac in sp,pr what is that problem ?

Well without a model number, I can tell you this. On some models, F3 indicates fan speed 3, which is high speed.If you push the mode button, these units will switch between f1, f2, f3 and smart fan. No problem.
On others, F3 indicates a fan speed error, either something is keeping the fan from turning, or there is a bad or loose connection somewhere.
On still other models, F3 indicates a freon leak or problem in the refrigerant circuit.
If carrier made their own units, they would probably act the same, but they don't. Model number is important, since the unit could be a daikin, LG or Samsung under the skin...

Room temperature sensor weak. Replace it.

Dear sir, If you are planning to buy a 5tr floor mounted ac than i suggest you to go for hitachi rather than carrier i personally use 3 hitachi ac's due to its quality and warranty. Its even more power saving than carrier or other brands.so i would suggest hitachi.

50TJ-012 is the modewl of 12,000BTU. That is 1 TR. Thanks,

remote hanset showing alaram code number 18 in11 tr ductable a/c.ther is no drain pump in unit