We have a new a/c & heating unit since June 2003. We have been using a 3M
filter that blocks allegens in our heating & a/c unit. It says to change at
least every three months which we have been doing. Our last filter went in
early May of this year.
I noticed last night that the a/c was constantly running and the temp in the
house did not go below 75 even though the thermostat was set around 70. I
figured that perhaps the coolant was low, but decided to check the filter. It
was black through and through on both sides. I did notice water that had
leaked on the floor.
I turned the system off and replaced the filter with a new clean one. I let
the system sit for over five hours thinking that perhaps it was frozen and had
to thaw. I then then tried turning it back on. I saw more water on the floor
and turned the system off and removed the new filter which was soaked.
Once I took the filter out the water seemed to flow better toward the outake
I have the system off currently. Any suggestions to what is going on? Should
I leave it off longer and wait for a thaw or could something else be happening
To email me delete NOjunk from the email address.
Quite possibly frozen. If its below 70 outside and you have your a/c set
for the same temperature, the coils could be freezing up. try raising your
thermostat to 75 or so. as long as it cycles on/off every so often, you
should be fine.
Is your condensate drain clogged? I don't know the geometry of your system but
if the condensate is not draining away it might be collecting and wicking up
into the filter.
Check for obstructions at the outlet and try pouring a SMALL amount of bleach
down the drain after you mop up enough water so it won't overflow.
Coils freeze up when they get too cold for the condensing water to
remain liquid and run off to the drain. They could be getting too cold
due to improper charge in the unit, insufficient air flow over the
coils, or perhaps the unit was just poorly installed.
If this is a one-time thing, perhaps your filter was so clogged with
dust and stuff that air flow was significantly reduced, and once the
system is fully thawed out and maintained with a new filter each month,
you'll be OK.
If it happens again, though, it's a sign of a more serious problem
requiring professional attention.
In either case, why not call a reliable, licensed HVAC crew in to do a
yearly check up. Tell them what you told us. Let them figure it out.
Hopefully the company that installed it is still around; give them a
shot at investigating it.
Is your system under warranty? I would call your installer and ask them
questions. The pros will know best.
If you thought the coil was froze, i would have left your unit on fan
only to keep air flowing past the coil to help defrost it faster.
I could be also your drain has crud in it from the original install that
is partially plugging it up.
I would have the coils checked, cleaned if necessary, and your drain
cleaned out and checked. Start with your originally installer.
If you have other problems such as charge level, if there competent they
will get to the bottom of it.
Seriously, so you really need the thermostat on 70?
Maybe you should get it cleaned out and try to run it set on 75 and
see what happens. This mentality that setting the thermostat lower will
help the house cool off faster drives my nuts. I know, because my wife
tries to do it.
Oh, come on now. It's common knowledge that setting the thermostat to a
lower temperature will always make the house cool faster.
It's also true that pushing the elevator button harder and faster will make
the elevator arrive more quickly. And, simply mashing the accelerator pedal
to the floor harder will increase the vehicle's rate of acceleration.
... and then there are those like my wife, who, being pregnant, is
keeing the house at 70 F permanently.
She's usually the first to complain when I set it down to 72 (it's
FREEZING in here!) and walks around in a sweatshirt. But this summer,
due to the rugrat on the way, the house is a very cool 70, and she still
complains "It's HOT in here!"
Hot. Yeah, that's why the cat is sleeping on the dryer or my tower of AV
equipment. The poor thing is trying to keep warm!
at 02:27 PM, email@example.comNOjunk (BoyAngel1127) said:
[ ... ]
[ ... ]
Because the filter was wet, I wonder if the black was black mold. Since
you are using allergin filters, I assume someone in the house has
allergy problems. Mold spoors are usually at or near the top of the
list of allergin trouble makers.
Before the water problems, how did the old filters look when you
changed them? If they were very dirty you should consider changing them
more often and try to find out why there is so much dust in the air.
wordgame:123(abc):<14 9 20 5 2 9 18 4 at 22 15 9 3 5 14 5 20 dot 3 15
13> (Barry Mann)
[sorry about the puzzle, spammers are ruining my mailbox]
CHECK it every 30...and I have more info below on those crappy damn
Black? Anyone a candle burner?
No matter, get rid of that POS 3M filter and get one that will not restrict
your airflow as bad.
WAY overpriced, and no need for that much restriction. IF you need that much
filter, you should seriously consider something along the lines of an
A-Coil was PROBABLY frozen, along with a clogged drain. DO NOT use bleach to
try to clean it out.
Bleach, should you get it on the coils, will start to cause damage.
Depending on your unit, and where the filter is located, this could be a
warning that your return duct is not set up for the added restriction of the
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.