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Section 1: RTU Doesn't Report Alarms

1. The first step to troubleshooting a failed RTU is to isolate the problem. There are three possible reasons why an RTU isn't reporting alarms:
   
   1. The RTU isn't working.
   2. The RTU isn't detecting alarms from the sensor.
   3. The RTU can't report alarms to the master.
2. Verify that the RTU has power.
   
   1. Is the power LED on?
   2. Make sure the power supply is working.
   3. Check for burned-out fuses.
3. Verify that the RTU is detecting alarms.
   
   1. Look for some kind of local indication that the RTU receiving data.
   2. Does the RTU have LEDs that indicate that an alarm has been triggered?
   3. Is there a software interface to the RTU that you can use to monitor locally?
   4. If you can't verify that the RTU is detecting an alarm, follow the troubleshooting instructions in Section 2, "Wiring Problems."
4. Verify that the RTU can transmit data.
   
   1. Check for an LED or a software interface that can give you a local indication that the RTU is transmitting.
   2. If you can't verify that the RTU is transmitting, troubleshoot the RTU's communication link to the outside world. Depending on the type of RTU, follow the troubleshooting instructions in:
   3. Section 8: "Serial Remotes Can't Connect to Master."
   4. Section 9: "IP Remotes Can't Connect to LAN."
   5. Section 11: "Dial-Up Remotes Can't Dial Out."

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