By default, the WMI UTC Time sensor goes into Error state only when something occurs during the execution of the WMI request to the target device.
However, like with the other sensors you can configure channel limits.
For example, with this sensor you can configure alerts when the value in the channel "Difference" is higher than a defined time (in seconds).
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.