5.3 Troubleshooting
Fault codes
When trouble occurs during normal operation of the Model 7100E, 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
5.3.1.1 Fault Code 1 – Oven or sensor warming up
The “Oven or Sensor warming up” fault indicates that the oxygen sensor is being heated to its operating
temperature after a fresh power up. The purpose of the alarm is to provide a control output to indicate
that the sensor has not yet reached its operating temperature, and the Model 7100E is not yet ready for
in-service oxygen measurement.
5.3.1.2 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).
5.3.1.3 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 7100E 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.
5.3.1.4 Fault Code 5 – Analog output range overflow
The “Analog Output range overflow” fault indicates oxygen reading that is above the range configuration
entered in the Model 7100E 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.
5.3.1.5 Fault Code 6 – Analog output range underflow
The “Analog Output range overflow” fault indicates a reading that is below the range configuration entered
in the Model 7100E 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).
5.3.1.6 Fault Code 8 – A concentration reading is not yet available
The “concentration reading is not yet available” fault is active when the Model 7100E is not ready for
online service. It is active during start-up, calibration and during fault code-2 – relays are in standby
mode.
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