Applicable Systems
Cleaver-Brooks Hawk 6000 Controller
Symptoms
The boiler reports a low flue gas oxygen alarm. The oxygen content in the flue gas is too low.
Possible Causes
- Insufficient combustion air causing rich combustion
- Burner air-fuel ratio too rich
- Oxygen sensor calibration drift
Troubleshooting Steps
- Step 1: Check the flue gas oxygen with an analyzer
Oxygen is within the target range - Step 2: Adjust the burner air-fuel ratio
Ratio provides complete combustion - Step 3: Verify or recalibrate the oxygen sensor
Sensor reads accurately
How to Reset
To reset: Correct the combustion settings, then clear the alarm.
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Source: Cleaver-Brooks Boiler Manual, Cleaver-Brooks Inc.
Category: Boiler
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