4.3 Troubleshooting
4.3.1 Fault Codes
When trouble occurs during normal operation of the model 1100, the user has several tools
available to aid in isolating the cause(s) of given symptoms. As a starting point, the user may use
the control panel to enter into “View Active Faults” mode (section 3.2.4). The user may also view
active faults and other useful information via the Service Port (section 4.1.2). In addition, there are
four system Hot-Keys available to perform special functions, and to gather important information
quickly and easily (Appendix-D). Descriptions of faults are given below, with indication of common
causes. Refer to the appropriate sections of this manual for more details as needed.
4.3.1.1 Fault Code 2 – Relays are in Standby mode
The “Relays are in Standby mode” fault indicates that the user has aborted the control panel user
mode menu properly (section 3.2.5), and the unit is in a stabilization period to allow time to sweep
the sample lines with sample gas before returning the unit to on-line service. During the
stabilization period, Alarm-1, Alarm-2, and Fault relays remain inactive, and held to their last state
before the control panel user mode menu was accessed. The factory default setting for this period
is 120-seconds. This setting is user-configurable (section 4.1.2.10.8).
4.3.1.2 Fault Code 3 – Device is in Setup mode – Service Port
The “Device is in Setup mode” fault indicates that the user has entered the user setup mode from
the service port (section 4.1.2), and the model 1100 is not monitoring oxygen in the process. The
7-segment alphanumeric display will show “SU”. The Device is in Setup Mode fault will clear when
the user returns the unit to Run mode.
4.3.1.3 Fault Code 5 – Analog Output range overflow
The “Analog Output range overflow” fault indicates an oxygen reading that is above the range
configuration entered in the model 1100 setup (section 4.1.2.12). Possible causes of fault code-5
may be: Incorrect or contaminated calibration gases, faulty process or calibration sampling
lines/components.
4.3.1.4 Fault Code 6 – Analog Output range underflow
The “Analog Output range overflow” fault indicates an oxygen reading that is below the range
configuration entered in the model 1100 setup (section 4.1.2.12). Possible causes of fault code-6
may be: Analog Range lower limit set to a value greater than zero (section 4.1.2.11.1).
4.3.1.5 Fault Code 8 – A concentration reading is not yet available
The “concentration reading is not yet available” fault is active when the model 1100 is not ready for
online service. It is active during start-up, calibration and during fault code-2 – relays are in
standby mode.
4.3.1.6 Fault Code 10 –Sensor appears to be disconnected
The “Sensor appears to be disconnected” fault indicates that there is not a continuous electrical
circuit connecting the Model 1100 and the oxygen sensor. Possible causes may be: An open in
the sensor interface wiring, faulty connecting hardware on/in the model 1100 or the sensor, the
sensor interface cable has been unplugged.
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