General Monitors 2180A - Fault Codes; Table 9: Troubleshooting Table

Model 2180A
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5.3 Fault Codes
In addition to the Fault LED on the front panel, the Model 2180A provides a fault code on
the digital display whenever a fault condition occurs. The Fault Codes that can appear on
the digital display are:
FAULT
CODE
DESCRIPTION SOLUTION
AO
Open Analog Output Signal Check connections on rear terminal AC(+)
and AO(-) and the analog output circuitry. If
the problem is fixed, but “AO” is still
displayed, restart the 2180A unit.
HI
High Supply Voltage Make sure the supply voltage level is within
specification limits.
LO
Low Supply Voltage Make sure the supply voltage level is within
specification limits.
SE
Sensor Failure
Sensor heater connections are open,
shorted, defective, or wired incorrectly.
Make sure the sensor wires are connected
properly (in the field and at the rear of the
unit) and recalibrate if necessary. If this fault
continues to occur, replace the sensor.
F2
Failed to Complete
Calibration
If this fault occurs, remove the gas and
expose the sensor to clean air for at least
five minutes. Then attempt another
calibration. If the second attempt fails,
replace the sensor. If this fault continues to
occur after the sensor has been replaced,
consult the factory or your GMI
Representative.
F3
Software Checksum Error This fault occurs during initial power-up of
the unit. If this fault occurs, remove and
reapply power to the unit. If the fault
continues to occur, consult the factory or
your GMI Representative.
F5
Reset Button Malfunction If the fault occurs, consult the factory or your
GMI Representative.
F6
Mode Select Button
Malfunction
If the fault occurs, consult the factory or your
GMI Representative.
F7
EEPROM Verification Error
for Calibration Storage
If the fault occurs, consult the factory or your
GMI Representative.
F8
EEPROM Verification Error
for Setup Storage
If the fault occurs, consult the factory or your
GMI Representative.
F9
Calibration Check Period
Exceeded
If the calibration checks gas is left on the
sensor for more than 6 minutes, this fault
occurs. Remove the gas and expose the
sensor to clean air.
Table 9: Troubleshooting Table