Chapter 5: Diagnostics and Troubleshooting
HOBO U30 Remote Monitoring System User’s Guide
49
Chapter 5:
Diagnostics and troubleshooting
This chapter lists some symptoms and tips to help you confirm correct
operation of your logger, and help you diagnose possible problems.
•
Indicator LED behavior
•
Problems and solutions
Indicator LED behavior
The indicator LEDs can provide helpful clues as to what the HOBO U30
Station is doing, especially when it is not behaving as expected. This is a
diagram of the LEDs in the HOBO U30 Station. Use it with the following
table to identify LED behavior.
logging
alarm
sensor active
Server/USB communication
Network Status
ACTIVE
EX. ON
Analog
Sensor
Port LEDS
Chapter 5: Diagnostics and Troubleshooting
50
HOBO U30 Remote Monitoring System User’s Guide
Indicator LED
Action
What it means
Logging Blinking
green
Indicates the system is currently
logging. It blinks every two seconds
while the logger is recording data from
sensors. Do not add sensors while this
indicator is blinking unless you plan to
select “Force Relaunch on Next
Readout” with HOBOlink.
If this indicator is not blinking when
you believe it should, make sure the
HOBO U30 Station has been
launched.
Blinking
red
There was a Smart Sensor or Analog
Sensor Port communication failure.
Investigate this problem immediately.
Look for a loose connection, which
could cause bad electrical contact with
a sensor. If found, remove the
offending sensor and check its wires
and connector for damage and/or
signs of moisture.
Blinking
orange
There was a communication failure,
but the system has recovered. There
may be an intermittent problem. Try
checking the Smart Sensors one at a
time to make sure they are all
communicating. If you find a bad
sensor, or if no sensor communicates,
contact your Onset Authorized Dealer
or Onset Technical Support.
Alarm
Blinking
An alarm was tripped.
Sensor Active
Blinking
Smart Sensor network
communications are occurring.
Server/USB
communication
Blinking
There is active communication from
the HOBO U30 Station to
HOBOlink.com or to the computer if
using a USB cable.
Network Status Single blue blink
with long pause
then a single
blue blink
The system found the cellular tower
and is trying to connect to the server.
