Monitoring network infrastructure with PRTG

[PCharkiewicz]

Dear Cisco Team, 

I am new in this forum. Recently we have implemented new PRTG monitoring system. 
We are seeing some alarms coming from one of our core router. When I am login to the core directly health status is OK. 

Could you please share your thoughts.

It could be a bug on Cisco and it' sending false information or PSUs should be replaced?

Sensor	System Health Voltages (SNMP Cisco System Health)
Status	Down
Last Result	0 V (Voltage Te1/4 Supply Voltage Sensor)
Last Message	0 V (Voltage Te1/4 Supply Voltage Sensor) is below the error limit of 7 V

Sensor History

11/12/2015 05:05:53 Down, 0 V (Voltage Te1/4 Supply Voltage Sensor) is below the error limit of 7 V 11/12/2015 05:02:16 Unknown, No data since 11/12/2015 04:59:42 11/12/2015 04:17:08 Down, 0 V (Voltage Te1/4 Supply Voltage Sensor) is below the error limit of 7 V 11/12/2015 04:17:04 Unknown, No data since 11/12/2015 04:14:42