Leaky compression joints?

[thammel]

One of my mini-splits wasn't cooling so the HVAC guy added Freon and a dye and will come back in 4 weeks. This mini-split has only been in service for 4 years. I ran the lines in the wall and the upper joints are accessible in an unheated crawlspace. I took photos - see below. Does this corrosion look like it is due to leaks at this location?

 

[Wrench97]

No leaks are usually oily.

 

[brewchief]

Looks more like soap bubbles were used to leak check during the initial installation, some brands will cause some corrosion like that if not rinsed off.

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[LS6 Tommy]

X2 on oil trace on a leak and also on the corrosion in the pics. BTW, those are flares, not compression fittings. You don't use compression fittings on HVAC lines.

Tommy

 

[Rusty Fords]

I vote leak detector solution tell tell leaks due to oil around leaky fittings. Those should be flare joints not compression.

 

[Terry D]

Like already said, it would be oily from a leak

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