After running for any length of time ( like overnight) air stops coming out
of our vents. The condenser outside is running and I hear the fan in the
attic running but there is very very little air movement. If I shut down
the unit for awhile and restart it there is good/normal airflow.
I had an AC man come out and he said our coils were clean and the unit
seemed to be operating fine with good airflow, but this morning, we were
back to no air movement.
Any ideas would be appreciated.
What would be freezing in the "blower" unit?
Why would that stop the air flow?
What should I look at in the blower unit to try and give the or any AC man
some direction and specific simptoms?
The outside condenser unit is running fine, when there isn't any air coming
out, wouldn't that be the part that freezes up?
Had another guy come over and he diagnosed it over the phone as icing up.
We ran the fan with AC off and then turned the unit off two hours before he
When he started examining the system he discovered the vents I had turned
off in several unused rooms restricting air flow ( new information to me
that you can't just close vents), as well as low outside temps, and a pound
low on Freon. We will see if this has fixed it we will know in a couple of
Thanks for the direction.
Water from the air condensing on the coils then freezing builds up until
it covers and blocks the air flow.
Just tell them what you told us. You don't need to tell them how to fix
it, all you need to is tell them why you called. It does not cool because
after running a while no air comes out. Any real tech will know what that
No it is the inside part that gets cold to cool your home. The outside
part actually heats up during use.
That sounds fair. I'd rather pay for an extra hour of labor instead
of having the repair guy not see the actual problem, misdiagnose it,
charge me, and then have to pay a lot more for another service call
later. That's what happened here.
Yeah but if he's in a position to visually verify that the coil is in fact
freezing over he can report that as a symptom and maybe save defrosting on
the clock. It's not like he'd be telling the guy what is wrong or how to
fix it, only that air flow slows and stops after it runs x hours and he
looked at the coil and it was an ice cube. That extra hour of tech time
might be better used watching it *start* to freeze over.
Sounds like probly ice is forming on the indoor coils--and means its time
for a check up.
Suggest call in a pro, he will take temperature and perhaps some air
velocity readings, and definately will check high and low side refrigerant
pressures and also perhaps check for leaks........
A *real* pro will give you a copy of these readings upon asking--in fact,
best when calling any outfit to let em know upfront you wish to get a hard
copy of this info....so far as hack outfits go this will help in separating
the wheat from the chaff at the get go.
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