Troubleshooting

The following table lists all fault messages, their priority levels, and corrective actions required to resolve them. The faults are listed in alphabetical order. Lower priority messages are output only after the highest priority message is cleared.

Table 17 Troubleshooting

Priority1

Display Message

Status LEDs(G/Y/R)

Latch Condition

Description

Resolution

35

“ACT Fault”

ON/ON/OFF

Latch

Indicates an out of range measurement

Replace the sensor.

24

“Beads Off Fault”

ON/ON/OFF

Latch

Indicates that the combustible sensors beads are OFF.

Acknowledge or cycle power to the sensor. Let the sensor warmup, then recalibrate the sensor. If this does not resolve the issue, replace the sensor.

23

“Calibration Required”

ON/ON/OFF

Latch

Indicates the sensor requires calibration.

Calibrate the sensor(s) attached to the instrument.

25

“Channel Error”

ON/ON/OFF

Latch

Indicates that there is an error in the mA output system.

Reset the sensor. Verify sensor configurations (if different from default values). Then recalibrate the sensor. IF this does not resolve the issue, replace the sensor. Check the mA output system on the main pcb.

7

“Configuration Fault”

ON/ON/OFF

Latch

Indicates that an incorrect configuration was detected.

Typically this is a unit with both sensors disabled and no sensor attached. Attach one sensor to the unit.

16

"Diffusion Supervision Fault"

ON/ON/OFF

Non-Latch

Indicates the sensor has detected a blockage in the gas path.

Refer to section .

4

“EEPROM Fault”

ON/ON/OFF

Latch

Indicates there is an error with the EEPROM.

Select Controller Data Reset t from Instrument menu. Verify the customer settings. Replace the main PCBA.

29

“External Memory Access Error”

ON/ON/OFF

Latch

Indicates that an error occurred communicating to the EEPROM.

Select Reset Main Unit from Instrument menu. Verify the customer settings. Replace the main PCBA

30

“External Memory Checksum Error”

ON/ON/OFF

Latch

Indicates the EEPROM memory is not valid.

Select Controller Data Reset from Instrument menu. Verify any custom settings and re calibrate the instrument.

3

“Flash Checksum Fault”

ON/ON/OFF

Latch

Indicates there is something incorrect with the main PCBA’s program.

Replace the main PCBA.

8

“General System Error”

ON/ON/OFF

Non-Latch

Indicates one of the internal power supplies is out of range.

Adjust the input power supply voltage to within range for the sensor configuration. Replace the main PCBA.

5

“Internal Circuit Fault”

ON/ON/OFF

Latch

Indicates a hardware failure on the main PCBA.

Replace the main PCBA.

33

“Lamp Fault”

ON/ON/OFF

Latch

Indicates the sensors lamp is not operating properly. (XIR PLUS sensors only)

Replace the sensor.

15

“Life and Health Fault”

ON/ON/OFF

Latch

Indicates the sensor is at the end of life.

Recalibrate the sensor to get additional life. If error does not clear after recalibration, replace the sensor.

36

“Low Signal Failure”

ON/ON/OFF

Non-Latch

This indicates the sensors output is low.

Clean the optics on the sensor or replace the sensor.

17

“Negative Drift”

ON/ON/OFF

Latch

This indicates the sensor is reading downscale.

Recalibrate the sensor.

26

“Negative Supply Fault“

ON/ON/OFF

Non-Latch

Indicates the negative power supply is out of range.

Check the input power supply. If this is within range, then replace the sensor.

N/A

“Over Range”

ON/ON/OFF

Non-Latch

An over scale gas reading is present.

Verify the area is clear of gas first then recalibrate the sensor.

31

“Parameter out of range”

ON/ON/OFF

Latch

Indicates that a setting is improperly set in the unit.

Select Control Data Reset from Instrument menu. Verify any customer settings. Then recalibrate the sensor.

2

“RAM Checksum Fault”

ON/ON/OFF

Latch

Indicates a bad RAM memory location was detected.

Replace the main PCBA.

34

“Reference Failure”

ON/ON/OFF

Latch

Indicates an out of range measurement.

Replace the sensor.

6

“Relay Fault”

ON/ON/OFF

Latch

Indicates that a problem with the relays was detected.

Replace the relay options PCBA.

22

“Sensor Configuration Reset”

ON/ON/OFF

Latch

Indicates the sensor datasheet was reset.

Calibrate the sensor.

12

“Sensor Element Error”

N/A

Latch

Indicates the sensor is broken.

Replace the sensor.

38

“Sensor End of Life Fault”

ON/ON/OFF

Latch

Indicates the sensor is at the end of life.

Recalibrate the sensor/replace the sensor.

27

“Sensor FLASH Error”

ON/ON/OFF

Latch

Indicates there is something wrong with the sensors program.

Replace the sensor.

13

“Sensor Heater Fault”

ON/ON/OFF

Latch

Indicates the sensors heater is not working properly.

Replace the sensor.

25-40

“Sensor Internal Fault”

ON/ON/OFF

Latch

Indicates the detection of a hardware issue in the sensor.

Replace the sensor.

9

“Sensor Missing”

ON/ON/OFF

Non-Latch

Indicates the sensor is no longer detected.

Replace the sensor.

28

“Sensor RAM Error”

ON/ON/OFF

Latch

Indicates a bad RAM memory location was detected.

Replace the sensor.

10

“Sensor Supply Voltage Fault”

ON/ON/OFF

Non-Latch

Indicates the sensors input voltage is out of range.

Check the input power supply voltage and check the wiring to the sensor module for damage. If this does not resolve the issue, replace the sensor.

20

“Span Calibration Fault”

ON/ON/OFF

Latch

Indicates the sensor did not pass the Span calibration operation.

Acknowledge the fault by pressing and holding both EZ touch buttons at the same time for up to 5 seconds. The unit will revert to the previous calibration so that the unit can continue to detect gas while troubleshooting fault. Causes for this fault include:

1. Span gas is not applied within the calibration time-out period
2. The incorrect span gas is applied or the span value is not set correctly in the Sensor Settings.
3. The sensor is at its end of life.

Check the span gas concentration and the sensor span value setting to ensure that the correct span gas is being used. Go through the calibration process again after verifying. If fault persists, replace the sensor.

1

“Supply Voltage Fault”

ON/ON/OFF

Non-Latch

The input power supply is out of the operating range. It may be too low or too high.

Check the input power supply is within range for the sensor configuration.

14

“TEDS CRC-16 Error”

ON/ON/OFF

Latch

Indicates the sensors datasheet is invalid.

Reset the sensor. Verify the sensor settings (if different from default), then recalibrate the sensor.

40

“Unknown Error”

ON/ON/OFF

N/A

Indicates that a sensor is returning an unknown error condition.

Replace the sensor or update the main PCBA software.

19

“Zero Calibration Fault”

ON/ON/OFF

Latch

Indicates the sensor did not pass the Zero calibration operation.

Acknowledge the fault to revert to the previous calibration. This fault can be caused by

1. A bad sensor
2. The sensor is trying to zero while span gas is being applied.

Check the zero gas cylinder is correct and within expiration date. If not using zero gas, ensure that there is not a background concentration of the target gas in the atmosphere. Go through the calibration process again after verifying. If fault persists, replace the sensor.

N/A

Full scale value and “LOC” displayed on the lower display areas per each sensor

ON/ON/OFF

Latch

Indicates a combustible sensors over range condition was measured.

Acknowledge the sensor, wait for the warmup time period and recalibrate the sensor.

N/A

Gas value is still shown.

Both side green LEDs blinking

N/A

Indicates that calibration is recommended. (TruCal sensors only)

Calibrate the sensors attached to the unit.

11

Parameter Fault (Sensor)

ON/ON/OFF

Latch

Indicates that a setting is improperly set in the unit.

Reset the sensors datasheets. Verify any customer settings. Then recalibrate the sensor.

1 Lower numbers have higher priority