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Troubleshoot
December 2022
Recommended actions
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
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
heater circuit wiring open.
2
Recommended actions
Potential cause
O
heater open.
2
Recommended actions
226
1. Check sample block thermocouple wiring per
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.
1. Check all wiring between the electronics and sensor housings per
9-2.
2. Correct wiring faults.
1. Check O2 cell heater circuit for broken wire or loose connection per
Figure 9-2
and
Figure
2. Repair broken wire or loose connection.
1. Check resistance of O
Normal O
heater resistance is 62.5 Ohms.
2
2. Replace O
heater if heater is open or has a large resistance.
2
10-8.
heater per
Figure
10-8.
2
Manual
00809-0500-4880
Figure 9-2
and
Figure
Figure
Emerson.com/Rosemount
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