I2C communication with DAC
Not that I'm aware of, however an alternative solution to debug this is to use an oscilloscope or logic analyzer to check the binary message's Ack bit to see if there's a handshake, bit 9 on SCL signal. 



If it doesn't acknowledge, then you either


have the wrong address of the DAC
setup I2C communication at wrong baudrate
missing or have wrong pull-down/up resistors values


If it does acknowledge then you either


aren't sending the right messages to make it work
don't have a valid voltage for it to reference


Response to Update

You should read the datasheet.
It's clear that the DAC responds to the uC, however it's not clear based on what you've given to us whether your set of exchanged messaged with the DAC is appropriate, and it looks like it's a set of bytes that need to be exchanged for a single command.

On top of that, you need to ensure the rest of settings are set to the appropriate application, like power mode, scaling of voltage, etc...