2 posts / 0 new
Last post
ac problem question

hello everyone

i have a 2.5 ton carrier cental ac system inside handler is the fe4a 300.

im having some problems with it,  it recently started leaking water so it was cleaned ti was dirty but since then i can't get it to work right.

its constanlty leaking water sometimes freezing up etc.

if you put water into the drain pan it flows into the pump and sooner or later the pump will kick on and empty so its not a clogged drain line but it seems when its going slow its leaking out all over as if its somehow going under the drain lines onto the cabines area,  also the bottom part of the ac unit even with secured with the screws can be pushed in right there and you then can see water coming from underneath the panel and sometimes even from the drain line pipes themselves or shoudl say right under then and one time someone even on top of them.

i am at my wits end on this,  its costing me tons of sleep and then when i can get sleep i end up not doin ganything during the early day becasue thats when its coolest out and i can get 4 or so hours or sleep without an over abundent amount of tossing and turning.

i just don't know where to turn from here,  i'd think if the coils was still too dirty and it just seems like something is not lining up right for the water leak and i am not sure if thats causing hte ac to not work right or not.

what happens is we'll turn on the ac and it will start to cool but say its 85 or 86 it will go down 1 or 2 degree's then it will go back up.  sometimes the coils are frozen but most of the time they are not, i am at my wits end.

any suggestions would be appreciated.



Re: ac problem question


Why does water form in my air conditioner?



Your AC’s inside unit contains the evaporator coil (pictured on the right) that cools the warm air blown over it. This causes condensation (moisture) to form on the coil, just like how water droplets form on a cold glass of water on a hot day.


The moisture on the coil drips into a drain pan and down a condensate drain line (a white PVC pipe) that leads out your home.


Cause 1: Clogged condensate drain line

A clogged condensate drain line is the most common cause of water leaking from your AC into your home.


If the drain line gets clogged with dust, dirt, sludge or mold, that water backs up into your home. In that case, you’ll need to unclog it. There are multiple unclogging methods, like using a wet/dry vac on the condensate line.


But the surefire way is to have a professional use a special vacuum to suck the blockage material out.


Cause 2: Damaged/rusted drain pan

Got an old air conditioner (12-15 years)? The drain pan may be damaged or rusted through, so water just falls right through. You’ll need to replace the pan.


Cause 3: Broken condensate pump

Is your furnace and indoor AC unit installed in the basement? If so then there is a condensate pump that pumps the water outside. But if the pump breaks, the water isn’t being pumped outside anymore. You will need to repair or replace the pump.


Cause 4: Dirty air filter

A dirty air filter blocks airflow over the evaporator coil. When that happens, the evaporator coil gets too cold and freezes over. When it melts, it drips an excess amount of water that the pan may not be able to handle.


Check your air filter to see if it’s dirty and change it if needed. You should be changing it every 1-3 months (depending on the season).


Cause 5: Low refrigerant

Similar to a dirty air filter, low refrigerant will lower pressure in the AC system, causing the evaporator coil to freeze over. When the coil melts, water overflows the drain pan.


You’ll notice you’re low on refrigerant when:


The air conditioner isn’t cooling well

You hear a hissing or bubbling noise (indicating a refrigerant leak)

Depending on the severity of the refrigerant leak you’ll either repair the leak or replace the whole AC unit.

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.