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Instruction Manual IM-106-880, Rev 2.0 October 2009 OCX 8800 SB TC Open (Sample block heater thermocouple open) Probable Cause Recommended Corrective Action Sample block thermocouple or thermocouple circuit open Check sample block thermocouple and circuit wires for breaks or loose connections per Figure 8-3 and Figure 9-8. Repair breaks or loose connections or replace failed thermocouple. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. O2 TC Shorted (Oxygen sensor heater thermocouple shorted) Probable Cause Recommended Corrective Action O2 thermocouple or thermocouple circuit shorted Check O2 thermocouple and circuit wires for short circuit condition per Figure 8-3 and Figure 9-8. Repair shorted wiring or replace failed thermocouple. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. If alarm persists, refer to the O2 Htr Failure alarm procedure. Slow heatup during cold start COe TC Shorted (Combustibles sensor heater thermocouple shorted) Probable Cause Recommended Corrective Action Combustibles sensor thermocouple shorted Check thermocouple resistance (lead to ground) of reference and active thermocouples per Figure 8-3 and Figure 9-9. If either thermocouple is open or shorted to ground, replace combustibles sensor. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. If alarm persists, refer to the COe Htr Failure alarm procedure. Slow heatup during cold start SB TC Shorted (Sample block heater thermocouple shorted) Probable Cause Recommended Corrective Action Sample block thermocouple or thermocouple circuit shorted Check sample block thermocouple and circuit wires for short circuit condition per Figure 8-3 and Figure 9-8. Repair shorted wiring or replace failed thermocouple. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. If alarm persists, refer to the SB Htr Failure alarm procedure. Slow heatup during cold start O2 TC Reversed (Oxygen sensor heater thermocouple reversed) Probable Cause Recommended Corrective Action O2 thermocouple wires reversed Check O2 thermocouple wiring per Figure 8-3 and Figure 9-8. Check the wiring at the sensor and inside the electronics housing. Correct reversed-wires fault. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. COe TC Reversed (Combustibles sensor block heater thermocouple reversed) Probable Cause Recommended Corrective Action Combustibles thermocouple wires reversed Check combustibles thermocouple wiring per Figure 8-3 and Figure 9-9. Check the wiring at the sensor and inside the electronics housing. Correct reversed-wires fault. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. SB TC Reversed (Sample block heater thermocouple reversed) Probable Cause Recommended Corrective Action Sample block thermocouple wires reversed Check sample block thermocouple wiring per Figure 8-3 and Figure 9-8. Check the wiring at the sensor and inside the electronics housing. Correct reversed-wires fault. Perform Reset procedure in Section 3, Configuration and Startup to continue operation. Table continued on next page 8-5
