Table 5-1. Troubleshooting Guidelines
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
Display
flashes
Err 6.
Battery power exhausted Connect to line power for recharge.
Output
signal
not
present.
Wiring error Check connections.
Initial Calibration was not
performed.
Perform Initial Calibration.
Sensor cell missing.
See SYMPTOM: "Display flashes Err
1".
Sensor signal is
under-range.
See SYMPTOM: "Display shows UND".
Error detected.
See "Symptom" column for specific
error.
Display
shows
SENSOR.
Sensor cell output is below
acceptable signal level.
Replace sensing cell and
perform an Initial Calibration.
No
response
to
manual
ZERO or
CAL
command.
Unit is set up for
AUTOCAL use, and autocal
unit or gases are not
present.
De-activate AUTOCAL mode by setting
Future Calibration date to 12-31-1993.
Display
shows
UND.
Cell signal is under-range.
Perform regular zero or full calibration.
If calibration fails, see above
SYMPTOM: "Display shows CAL
FAULT". If UND persists, replace cell
and perform Initial Calibration. NOTE:
Although sensor output is not present
during UND condition with no gas
present, output will correctly respond to
the presence of gas. When gas is no
longer present, output will no longer be
present. This function serves to alert the
user that an abnormal condition exists
and calibration or other maintenance is
required.
Low gas
reading.
Clogged sensor water stop
disc.
Clean or replace disc.
Misaligned stop disc. Re-align disc and gasket.
Poor gas flow or damaged
cell.
See SYMPTOM "Display shows CAL
FAULT".
Display
shows
LO FLO
Restricted air flow. Clear tubing.
Pump inoperative. Replace pump.
Chapter 5, Maintenance
5-7
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