Home AC Freezes Up and HVAC Companies Have No Fix
13 posts since Jul 2026, all from r/hvacadvice.
“Hey all- There is water leaking from the bottom of my furnace after long periods of running the ac. Lennox C33-36C-2F. It was installed in 03, so pretty old. I’ve already vacuumed out the external drain line to be sure nothing is clogged there. I suspect a clog where the drain…”
“I am in Wisconsin and we have had some very hot points over this summer. During one of the last heat spells my A/C would either kick out or have trouble starting. There would be a clicking noise that appeared to be the fan struggling to start/stay running. I called a local hvac…”
“I'm on the 2nd/top floor of a small multi-unit HOA dwelling. AC compressors are on the four corners of the roof. Recently I've been getting this "wum wum wum" ~2Hz sound at different locations throughout my unit without any particular pattern. I think it's only happening when…”
Homeowners are experiencing issues with their HVAC systems, including furnace fuses blowing, AC units being noisy or freezing up, and mini-splits emitting odors. Many are seeking advice on troubleshooting these problems and finding reliable repair solutions.
SOURCES (13)
“I have noticed that in my AC, this part is cracked, should I be worried? submitted by /u/JeyPi1124 [link] [comments]”
“I am in Wisconsin and we have had some very hot points over this summer. During one of the last heat spells my A/C would either kick out or have trouble starting. There would be a clicking noise that appeared to be the fan struggling to start/stay running. I called a local hvac company and dude was here for a while and stated my capacitor was low but not in the bad range but decided to replace it anyways (which I agreed). He then stated that the low voltage wires (or something like that) were no”
In the video you will hear the sound I am talking about. The unit can run fine for hours at a time and then occasionally I hear it making this sound. When…
“I'm on the 2nd/top floor of a small multi-unit HOA dwelling. AC compressors are on the four corners of the roof. Recently I've been getting this "wum wum wum" ~2Hz sound at different locations throughout my unit without any particular pattern. I think it's only happening when multiple compressors are on. If I'm directly under one compressor when standing in my patio, I only hear a steady state mechanical hum. But in a different location outside equidistant between two c”
“This unit hasn't been serviced in at least 10 years since I bought the house due to my own laziness. Most I've done is clean the coils, but this year it started rattling pretty bad while running. Just wondering if anyone has any trouble shooting advice! Thanks in advance submitted by /u/ChapterVirtual5581 [link] [comments]”
“The attached video is me recording the unit in my garage so you can hear the sounds. I got my ac replaced about two weeks ago but it could just be being paranoid but I can’t hear a faint squeal coming from the indoor unit instead of a smooth blowing sound. The blower fan was just replaced as well so could it be something like that? Thanks! submitted by /u/BusinessAngle8153 [link] [comments]”
“My outside AC unit started making a clicking sound, no rythm, just random, ac still gets cold as can be, replaced capacitor probably 2 years ago, new thermostat about a year ago as well, no visible debris, will take fan off tomorrow for a better look, maybe test mF on capacitor as well. submitted by /u/crazyfingerguy [link] [comments]”
“My Variable air conditioner is making a water dripping noise when on. I had a guy come out to look at it and he said that it was because the unit inside was not getting enough air flow so I got the filter and it still makes that noise what do I do? submitted by /u/Exotic-Tea-4490 [link] [comments]”
“We heard a pop and the air conditioner shut off. I read in other boards that it might be 3 amp fuse in the ignition board. But I don’t see what is described? Does this board have a different type of board? White Rodgers 50a50-406 submitted by /u/Halo5280 [link] [comments]”
“Sometime during the night my AC stopped working. We’re in a heat wave so it’s been working pretty hard. Opening up the panel on my furnace I smelled something hot. Looking at the bottom of it, I see this little fuse with some moisture around it. Not sure if that’s the source, but it’s concerning. I’ve called out a professional, but they said it could be a few days before they can take a look. I’m just trying to gather some info while I wait. I reset the thermostat, checked the breaker, looked fo”
“Hey all- There is water leaking from the bottom of my furnace after long periods of running the ac. Lennox C33-36C-2F. It was installed in 03, so pretty old. I’ve already vacuumed out the external drain line to be sure nothing is clogged there. I suspect a clog where the drain pan feeds into the external pvc drain line, but the problem is I’m having difficulties removing the access panel. The silver sheet metal seems really secure, even after removing all the perimeter screws. (I know the pictur”
“I’m hoping someone can point me in the right direction because I’m running out of ideas. My central AC continues to freeze up during hot weather, even after multiple HVAC companies have looked at it. What has already been checked: Clean filter. Refrigerant charge was recently checked and topped off. Multiple HVAC companies have inspected it without finding the root cause. System: Bryant Evolution communicating system. 5-ton condenser and evaporator coil. Motorized zoning dampers. Four-story home”
“Just installed the Friedrich Wallmaster WCVT16B30A (16,000 BTU with a "precision" inverter using R-32 Refrigerant). I bought it because my old unit was failing and because I thought it would be a lot quieter. Well, I will say that the compressor itself is not very loud and doesn't kick like a mule when coming online like the old unit. It's more of a high pitched whine which isn't terrible unless I happen to have another window open and can hear the outside noise. However, t”