Trane XR11 heat pump problem with compressor not always starting right away..
I have a approx 6 year old Trane XR11 split system heat pump that I have recently started having a very intermittent problem / noise with. The indoor air handler runs perfect and about 95% of the time the outside unit will start without issue. I noticed it about 3 or so months ago and sometimes it will happen several times in a day and others it can go for weeks without it occurring. When it happens this is sorta how things go..
The fan on the outdoor unit will start but the compressor will not. It will make a *click click* (sometimes only once or twice and others it will happen 4-6 times) noise and stop. 30 or so seconds will go by and it will do it again then stop. Eventually the compressor kicks on and everything runs fine. The fan runs continuously throughout all of this. At first I thought the *click click* noise was the contactor or something, but if you stand close to the unit you can feel the unit shake a bit so I highly doubt the little contactor is making it shake like that but I guess anything is possible. I opened up the section with all of the connections and everything LOOKS fine. There is a green LED on the board that is blinking normal. All of the electrical connections are tight. The capacitor looks to be somewhat new but I don't have a meter right at this moment to test it but there is no bulge or oil leaking from it. The contacts on the contactor are a bit pitted, but they don't look bad at all (I would have cleaned them but I need to find something small enough to get into it) and I watched it seal in a few times and that seems to be working fine. Of course I could not get the noise to happen while I was watching it but we all know how that works.
Long story short is that everything looks to be in working order so I am looking to anyone who might have any other ideas on what to check or what to do. Like I said this is very intermittent when it happens so what makes it happen is really beyond me. Hopefully this all makes sense haha! Any help or ideas would be greatly appreciated!
I was outside clearing some snow earlier today and it did it 2 times in a row. The first time it did it, it was a solid 3 or 4 minutes before the compressor finally kicked on. *sigh* Ideas?
Edit: I purchased the house about 5 months ago so I am not sure how long this has been going on for before I moved in.