Maybe you can call. As usual Carrier is not a good brand.

You got it for new or used?
How long never service if used?

Smell not related the brand name, if you got staircase or height enough, then slightly open on air blade until can see internal fan blower, follow by used touch light pointing in, would be notice the thicken dusty on blower.

So you might hire someone for cleaning already

The dumb question is, did you take out the filter and clean?
Looks like the cooling coil are severely blocked.

freezing of coil normally suggests low refrigerant pressure that may be caused by
1. dented piping
2. low gas

Based on your description, it seems to be low gas.
It is possible that there may be refrigerant leakage from the system.

depends where leak and how they plan to rectify
any update on your situation?

1)Get AC contractor to troubleshoot and fix the leak then purge (into capturing tank) and refill? Is the pipe leaky in the first place or poor workmanship ie leak occurred at flaring nut? The second is easier to fix. If it's the first, I suggest to replace the pipes with better ones like Inaba Denko paircoil. The insulated pipes are sturdier and high quality. All depend on how it's installed and if there are kinks where pipe are laid.

2)Wow, reading from your postings in this thread, strongly hints of poor worksmanship in the installation esp the existing piping if when you moved in or had the AC guy to install which to me is highly suspect. I recommend you get a good installer and redo the piping: take out and put in higher quality ones. Otherwise no matter what AC installed also will consistently face this issue. A good installation don't leak gas. In SG or even here, with regular maintenance by good AC guys, they last 10 years upwards and even 15 years or more.

3)Is your place landed or condo and are you located in Klang Valley? If so, depending on where you live, I can recommend an installer. You may want to contact forumer shadow_fax as he carries the piping I mentioned.

1) Actually it happen after few month the guy ( who relocation my aircon and service it) service my aircon. Yesterday he did came and say that my compressor is empty and he help to refill. And he mention that if my aircon gas is nearly empty and got ice on fin, there must be leaking. As the aircon nearly reach 3 y/o, he said better change the new one (no sure he malas to do job or what

2) wow bro, you really update my issue. Thanjs    .  I also suspect the same things but u know when ur family know one guy to do, you always stick to one guy no matter what (nasib duduk dgn family )

3) Landed 2 storey and in Klang Valley. ohh really sure I will contact him or you can pm me also 

Thanks your your kind reply

p/s: after he refill the gas, the aircom seems to be cold as normal. Let see 1-2 weeks before its start to give issue. Will update

Appreciate to know the brand n model?
First time heard indoor bocor, usually only the pipe leaking etc.

indoor coil leak is quite common.........especially at all the C joints at both sides of the evaporator coil.