If your Viking 22066F sprinkler escutcheon assembly isn’t functioning correctly, there could be a few potential issues to consider. First, ensure that the sprinkler itself is properly installed and hasn’t been damaged during installation. Check for any obstructions around the sprinkler that could be blocking water flow. Additionally, verify that the water supply to the sprinkler system is adequate and hasn’t been disrupted. If everything seems to be in order externally, it’s possible that there could be a problem with the internal components of the sprinkler, such as a clog or malfunction. In this case, it’s best to contact a professional technician to inspect and repair the sprinkler as needed.