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Manual
00809-0500-4881
9.3.11
SB TC Open
Sample block heater thermocouple open.
Potential cause
Sample block heater thermocouple or thermocouple circuit open.
Recommended actions
9.3.12
O
TC Shorted
2
Oxygen sensor heater thermocouple shorted.
Potential cause
O
thermocouple or thermocouple circuit shorted.
2
Recommended actions
Potential cause
Slow heat up during cold start.
Recommended actions
9.3.13
COe TC Shorted
Combustibles sensor heater thermocouple shorted.
Potential cause
Combustibles sensor thermocouple shorted.
Recommended actions
Potential cause
Slow heat up during cold start.
Rosemount OCX8800C
2. If either thermocouple is open or shorted to ground, replace combustibles
sensor.
1. Check sample block thermocouple and circuit wires for breaks or loose
connections per
Figure 9-2
2. Repair breaks or loose connections or replace failed thermocouple.
3. Perform
Reset
to continue operation.
1. Check O
thermocouple and circuit wires for short circuit condition per
2
9-2
and
Figure
10-17.
2. Repair shorted wire or replace failed thermocouple.
3. Perform
Reset
to continue operation.
1. Perform
Reset
to continue operation.
2. If alarm persists, refer to
1. Check thermocouple resistance (lead to ground) of reference and active
thermocouples per
Figure 9-2
2. If either thermocouple is open or shorted to ground, replace combustibles
sensor.
and
Figure
10-17.
O
Htr
Failure.
2
and
Figure
10-18.
Troubleshoot
April 2023
Figure
191
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