Recommended actions
1. Check sample block 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.
9.3.18 ADC Failure or ADC Ref Error
Voltage to digital conversion could not complete or voltage to digital version not
accurate.
Potential cause
Incorrect wiring between electronics and sensor housings.
Recommended actions
1. Check all wiring between the electronics and sensor housings per Figure
9-2.
2. Correct wiring faults.
Potential cause
Electronics package failure.
Recommended action
Replace electronics package.
9.3.19
O2 Htr Failure
Oxygen sensor heater could not reach final temperature.
Potential cause
O
2
heater circuit wiring open.
Recommended actions
1. Check O2 cell heater circuit for broken wire or loose connection per
Figure 9-2 and Figure 10-8.
2. Repair broken wire or loose connection.
Potential cause
O
2
heater open.
Recommended actions
1. Check resistance of O
2
heater per Figure 10-8.
Normal O
2
heater resistance is 62.5 Ohms.
2. Replace O
2
heater if heater is open or has a large resistance.
Troubleshoot
Manual
December 2022 00809-0500-4880
226 Emerson.com/Rosemount
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