I have 2 year old house with 2 Bryant A/C compressor units. One started making a noise earlier this year. It's hard to describe the noise but it's a throbbing low frequency noise. I had the pressure checked and he said it was at 3 when the unit specified 10. He wasn't sure what was causing the noise. He thought it could be the low pressure. He also said I was missing the line driers that are zip tied to every Bryant unit. He thought running a system for 2 years without them could also damage the units and be the cause of the noise but he wasn't sure. So my question is can running an A/C unit for 2 years cause damage to the system? How likely is that to happen and what would be the most prominent symptoms? I'm assuming they are there for a reason and not just for looks. I've got the original installers coming out in a few days to add the line driers that should have been there from day one. Should I have them do anything more then just adding the driers and then flush and charge the systems? Thanks,

[left] Hello everybody, So after using my newly purchased (used) LG portable air conditioner model LP1311BXR for about 1 hour, I started having some issues. Looking at it, I noticed the air swing had stopped working - so i decided to power off the unit to get it going again. To my surprise NONE of the buttons worked at all on the display, nor did the remote control. After unplugging (in an attempt to reset the unit) .. The Unit would not turn back on! As though the buttons weren’t working again. As many probably know, when you plug in any LG device, there is a pretty little chime noise indicating that it’s been plugged in. This noise did not happen, and none of the buttons would work to power on the device.The display is also non-functional. Also note that the green light on the plug is no longer illuminating. I thought maybe it had overheated or something like that so I left the unit unplugged for about an hour and decided to plug it back in. The compressor kicked right on and it sounded like an a/c doing it’s thing. However, still no screen or button function, and also the Exhust and Blower turbines are not spinning or functioning. You hear the compressor for about 30 seconds or so, then it clicks and whirs and nothing really happens. The lines on the condesor ARE getting ice cold for the 30 secs that the compressor stays on. It pains me to think I just purchased a dud unit .. “as-is” of course, but when i purchased it we tested it and it worked well! Then worked very well at my home for less than an hour - now this. I have managed to get the entire cabinet off of the unit and all wires and boards appear intact and unburnt.. But i do not even know where to begin on this. Any input is very much appreciated. I also have a video that i am trying to post onto here, so anybody willing to take a look I can send it over to. Thanks in advance!! [/left]