Emerson Rosemount OCX8800A - Page 225

Recommended actions
1. Check sample block thermocouple and circuit wires for short circuit
conditions per Figure 9-2 and Figure 10-8.
2. Perform Reset.
Potential cause
Slow heat up during cold start.
Recommended actions
1. Perform Reset to continue operation.
2. If alarm persists, refer to SB Htr Failure.
9.3.15 O2 TC Reversed
Oxygen sensor heater thermocouple reversed.
Potential cause
O
2
thermocouple wires reversed.
Recommended actions
1. Check O
2
thermocouple wiring per Figure 9-2 and Figure 10-8.
2. Check the wiring at the sensor and inside the electronics housing.
3. Correct reversed-wires fault.
4. Perform Reset to continue operation.
9.3.16
COe TC Reversed
Combustibles sensor block heater thermocouple reversed.
Potential cause
Combustibles thermocouple wires reversed.
Recommended actions
1. Check thermocouple wiring per Figure 9-2 and Figure 10-9.
2. Check the wiring at the sensor and inside the electronics housing.
3. Correct reversed-wires fault.
4. Perform Reset to continue operation.
9.3.17
SB TC Reversed
Sample block heater thermocouple reversed.
Potential cause
Sample block thermocouple wires reversed.
Manual
Troubleshoot
00809-0500-4880 December 2022
Rosemount OCX8800A 225