2. Replace COe sensor if resistance of sensor element is not between 100
and 250 ohms.
Potential cause
CJC sensor grounded.
Recommended actions
1. Check resistance of CJC sensor to ground per Figure 10-9.
2. Replace CJC sensor if resistance is less than 10M ohms.
Potential cause
CJC sensor failed.
Recommended actions
1. Check resistance CJC sensor per Figure 10-9.
2. Replace CJC sensor if resistance of sensor element is not between 100
and 150 ohms.
9.3.3 O2 Temp Hi
Oxygen sensor heater temperature high, > 1381 °F (750 °C).
Potential cause
High noise in Rosemount OCX8800 power supply.
Recommended actions
1. Check power supply for line noise or voltage fluctuations.
2. Install power line filter kit (PN 6A00171G01) or high quality line filter for
input power.
9.3.4
COe Temp Hi
Combustion sensor heater temperature high, > 590 °F (310 °C).
Potential cause
High noise in Rosemount OCX8800 power supply.
Recommended actions
1. Check power supply for line noise or voltage fluctuations.
2. Install power line filter kit (PN 6A00171G01) or high quality line filter for
input power.
9.3.5
SB Temp Hi
Sample block heater temperature high, > 374 °F (190 °C).
Troubleshoot
Manual
December 2022 00809-0500-4880
220 Emerson.com/Rosemount
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