I live in a 2 floor town home, approximately 1,500 square feet. The AC unit is a 2.5 ton and is in my backyard. The copper tubes go into the wall on the corner of the house on the 1st floor by the unit, and run all the way up the wall to the attic where it goes into the fan unit that circulates the air around the house.
I recently had to have the COIL, in the fan unit in the attic, replaced under warranty due to it rusting completely through (the unit is less than 3 years old, a HAIER). After this was done, every time the unit turns on now we can hear a very loud clicking noise in the wall of the master bedroom. It seems to be only in one spot of the wall, but it is coming from where the copper tube runs up from the AC unit outside on the first floor that goes through the 2nd (in our master bedroom) up to the fan unit in the attic. The clicking usually happens quite a bit when the unit first turns on, and it will stop after 15-20 seconds, occasionally you will hear a click out of nowhere while it is running, but it seems to happen mostly when it turns on. It tends to click faster at the start and slows down until it quits clicking completely.
We have tried securing the pipes in the attic to the wooden beams with zip ties, as the HVAC guy originally thought the pipe was rattling/moving when it kicked on. Unfortunately this did not solve the problem and we all have no ideas as to what could be causing it. Our HVAC guy is stumped.
He is suppose to be coming by in a day or two to do a complete freon removal, vacuum, and recharge to see if that solves the issue. Unfortunately the clicking wakes us up 6-10 times per night, as every time the AC kicks on it clicks and wakes us up. I'll be buying some earplugs tonight, that is for sure.
Has anyone here ever heard of this problem? Anyone know what could be causing it and how to fix it?
Any help would be greatly appreciated.