Original message
| tehjrow
 |  "Central AC pipes keep freezing"
, posted Tue 9 Sep 10:51  
Here's my story:
Moved into a duplex about 2 months ago. When we first moved in the A/C didn't work at all, the unit wouldn't even come on. My landlords "A/C guy" is just someone who lives in the neighborhood. He came by and said the entire unit was blown. Fan motor, capacitor, everything. Took a few days but the landlord bought a brand new unit and got the guy to put it in (not replacing anything in the ceiling, just the unit outside). It worked well for 2 days, then just started blowing hot air. Checked the pipes outside and they were hot. A/C guy came back out and found that the people who had lived there before me installed their own thermostat and wired it wrong, so it was telling the unit to blow hot instead of cold. He rewired it and things were good for about a week. Came home one day and its 90 degrees in the house. Go outside to look at the unit and the bigger of the two pipes was covered in at least an inch of ice. While it's fozen, no air comes out of the vents inside the house, but I can still hear the ceiling fan running. Guy came back out and checked the coolant levels and checked for leaks, level was good and no leaks. I checked the filter inside the house and it was a little dirty so we blamed it on that and I bought a replacement. Turned the unit on heat to melt the ice and let it sit off for a while. After that it worked fine....for 3 days. Came home, same thing. House it hot, big pipe is frozen, no air coming through the vents. Called A/C guy back out, he "went into the attic and checked the coil" and said it was ok. Turned heat on, unfroze pipes, all was well for 3 more days. This is where I am now.
So:
Big pipe freezes
No air from vents
Fan in ceiling still runs
Filter is clean
Coolant levels are good and no leaks
This leads me to 1 conclusion. It's gotta be something in the attic. I've never been up there and honestly wouldn't know what i'm looking for. I've been in attics before (wired and entire house) but have no experience with central AC.
Any suggestions?
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Replies:
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| lovo127
| "Re(1):Central AC pipes keep freezing" , posted Tue 16 Sep 21:55
well well mmm this ac guy seems to have free housing , now if the outdoor unit was replace end the indoor coil is old possible mismach units by r22 or r410a refrigerant = presures or seer rating if you go to the attic look for metering divice if txv thermal xpantion valve on the suction line The big pipe or line to the evaporator if is outside the coil cabinet will have some insullation aroud it unwraped the sesin bulb if is inside de cabinet pull it out n try go couple days with out problems is stuck could be the problem n have the ac guy to replace or not
any help counts
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| theduke03
| "Re(1):Central AC pipes keep freezing" , posted Tue 9 Sep 20:30
Sounds like it's a dirty evaporator coil. Did this "a/c Guy ever look at it? Did he ever put gages and a temperature device on the system to test it? I'm guessing no and no. If he did then that's even worse because he would have known there was a problem and left it like that anyway. Tell your landlord to send a reputable contractor to diagnose and repair the actual problem. The lack of airflow was caused by the evaporator coil being frozen.
If left in that condition your landlord will be replacing it again, and soon.
"My dad was the most feared furnace fighter in Northern Indiana."
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| rlj1117
| "Re(1):Central AC pipes keep freezing" , posted Tue 9 Sep 12:51
could be fan relay failing , try setting fan setting at t-stat to the 'on' position , verify air coming out of the vents , if air is coming out try that for a week if no freezing have a/c change fan relay , good luck
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