9.3.12 O2 TC Shorted
Oxygen sensor heater thermocouple shorted.
Potential cause
O
2
thermocouple or thermocouple circuit shorted.
Recommended actions
1. Check O
2
thermocouple and circuit wires for short circuit condition per
Figure 9-2 and Figure 10-8.
2. Repair shorted wire or replace failed thermocouple.
3. Perform Reset to continue operation.
Potential cause
Slow heat up during cold start.
Recommended actions
1. Perform Reset to continue operation.
2. If alarm persists, refer to O2 Htr Failure.
9.3.13 COe TC Shorted
Combustibles sensor heater thermocouple shorted.
Potential cause
Combustibles sensor thermocouple shorted.
Recommended actions
1. Check thermocouple resistance (lead to ground) of reference and active
thermocouples per Figure 9-2 and Figure 10-9.
2. If either thermocouple is open or shorted to ground, replace
combustibles sensor.
Potential cause
Slow heat up during cold start.
Recommended actions
1. Perform Reset to continue operation.
2. If alarm persists, refer to COe Htr Failure.
9.3.14
SB TC Shorted
Sample block heater thermocouple shorted.
Potential cause
Sample block thermocouple or thermocouple circuit shorted.
Troubleshoot
Manual
December 2022 00809-0500-4880
224 Emerson.com/Rosemount
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