When nworks uses "Refresh Hardware" calls, hardware status is not updated on vSphere 5
vSphere 5 does not update the hardware status data available through API - this can be verified in vSphere Managed Objects Browser, which shows an outdated status, while the host MOB will show the correct status. By default, this information is not updated in vCenter 5. The VI Client, however, has the valid data, since it uses CIM service for watching the sensor readings.
Please be aware that we’re making changes which will restrict access to product updates for users without an active contract.