A: There are two main causes for "Rectifier Over Temp" and "Rectifier Failure" alarms:
1.The temperature detection probe at the relevant detection position is damaged.
2.The circuit monitoring the temperature detection probe is faulty.
Q: How should I resolve these issues?
A: Based on the equipment model you provided, the specific troubleshooting steps are as follows:
1. Check the temperature detection probes (power off the unit first)
1）Locate the rectifier board and disconnect the temperature detection probe connectors (J13/J14/J15).
2）Measure the resistance of the temperature probes: the normal resistance should be 4.6–5.4 k Ω.
3）If any probe shows abnormally low resistance, replace it first, then restart the UPS to check if the alarms are cleared.
2. Check the signal cables between the temperature probes and the control board
1）If the resistance of the temperature probes is normal, reinstall them.
2）Unplug the J12 connector on the rectifier board, power on the UPS, and check whether the alarms still exist.
①If the faults disappear, the rectifier power board is abnormal.
②If the faults remain, the rectifier control board is abnormal.