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HCI is the technology, UX is the technique.

If the UX of making a phone call includes:

• having a phone device
• having an OS on the device
• having a phone app
• having phone service (being able to make calls)
• and the experience of the call
• the experience of hanging up or ending the call

In the case of making a phone call, the HCI is the phone's touchscreen.

Or for another example, for the UX of making an online bank transfer:

• you need a computer
• you need an operating system
• you need a web browser
• you need a banking website
• you need to have an internet connection
• you need to have an account
• you need to be able to log in and transfer money
• you need to be able to log out.

Each of these items is designed each one has its own error messages or fail states that need to inform the user of what's wrong (no OS, no browser, no internet service, no website, no account, etc).

In the case of making an online banking transfer, the HCI are your computer keyboard and mouse.

Does that make sense? UX encompasses all designed parts of an experience, HCI is concerned with the interfaces between humans and computers, usually in a physical sense (hardware) even more so than how you use the hardware (software, UI)