I just purchased a townhouse that is equipped with a Trane XR11 heatpump condenser out back. The system seems to be working as it should but I noticed a strange noise while I was getting the trash ready today. The fan started up (only the fan spinning.. no compressor) and ran for about 45 seconds or so. Then it made a strange clicking noise like a relay chattering or a contactor trying to pull in or something. It "clicked" 4 or 5 times then stopped as the fan continued to run. About a minute later it did the same thing with the clicking and stopped.. The fan spun for the entire time and then the compressor started and the system ran fine. I was outside for a few "cycles" and the next few times that the heat pump came on it started like it regularly did without the "clicking" issue. I have absolutely no HVAC experience so I am really not sure if this is a normal sound out of a heat pump so I figured this would be the best place to figure it out
The indoor unit has a install date of 2005 on a sticker from the company who put it in. Everything looks like it was taken care of and runs fine like I said so the noise that I heard might be something normal, but this is my first heat pump so I am really not sure! The condenser unit is clean and free from any debris and I cannot see any abnormal movement to cause the noise.
Any ideas on what may be causing this? Thanks a ton in advance! It will definitely make me stop running to the sliding glass door every time I hear the heat come on to see if its making noise! Thanks!