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Section 3: RTU Sends False or Fluctuating Alarms

1. If the alarm fluctuates over a short period, check if the RTU is repeatedly rebooting.

What's going on: Sometimes RTUs get locked into a cycle of recurring rebooting. Every time the RTU reboots, all alarms are cleared. And then the RTU detects an alarm, reports it … and then reboots, starting the cycle all over again.

2. If the alarm connector can be disengaged, remove it, and see if the alarm continues to fluctuate.

What's going on: Loose connectors make off-and-on contact, creating the intermittent alarm. To correct the problem, just screw the connector down tighter.

3. If the alarm still fluctuates, short the connector.
4. If the alarms stop when you short the connector, you've isolated the problem to the wiring. Check the wiring, following the instructions in Section 2, "Wiring Problems."

Note: If the wiring is OK, but the sensor regularly fluctuates, you can fix the problem by setting an alarm qualification time.

5. If the alarm fluctuates over a long period, you obviously don't want to disconnect the alarm all day. Move the alarm sensor wire to a different point, and see if the alarm continues to fluctuate.

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