Utica Dunkirk E71 Error Code
, E72, E78 and E92 - Indicates possible wrong calibration, a new calibration is
Source: dccf-115__utdu-dccf-115-dccf-205-dcbf-75-dcbf-165-iom.pdf
What does Utica Dunkirk E71 mean?
E71 is stored in the fault history of the Dunkirk DCCF/DCBF condensing boiler to indicate a possible wrong combustion calibration. The boiler's ionization-based combustion control detected a deviation during calibration or normal operation that suggests the stored reference values are no longer valid. A new automatic calibration is required to restore correct combustion control.
Symptoms
- E71 appears in the fault-history log — it is not displayed as a live lockout code.
- Boiler may continue to operate but with reduced combustion efficiency.
- E72, E78, or E92 may appear alongside E71, indicating the calibration issue spans multiple operating parameters.
- Combustion may be audibly unstable or produce excess condensate if calibration is significantly off.
Common causes
- Sensing electrode cleaned or replaced without running the automatic calibration function afterward.
- Combustion conditions changed (new gas supply, gas type, or pressure) without recalibration.
- Flue recirculation contaminating combustion air and causing calibration drift.
- Boiler firmware or PCB replaced without restoring calibration parameters.
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Diagnostic steps
Check the fault history for companion codes
Retrieve the full fault history and note whether E72, E78, or E92 appear alongside E71. E92 specifically indicates flue recirculation, which must be corrected before calibration.
Inspect and correct the flue system
If E92 is present, inspect the vent terminal for recirculation and correct the vent geometry before attempting recalibration.
Verify gas supply pressure
Measure supply gas pressure at the valve test port. Confirm it is within the specification for the installed gas type before initiating calibration.
Run the automatic calibration function
Initiate the automatic calibration sequence through the installer menu. The boiler fires through a controlled calibration cycle and re-establishes the ionization reference map.
Verify calibration completion
Confirm the calibration function completes without generating a new E53 or E55 fault. If it fails, check for flue obstruction, recirculation, or gas pressure issues before retrying.
When to call a professional
Call a licensed technician to run the automatic calibration function if you are not familiar with the installer-level menu on the DCCF/DCBF boiler. Calibration requires the boiler to fire under controlled conditions and involves monitoring ionization current. Incorrect calibration can result in unsafe combustion or repeated fault lockouts.
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Other Utica Dunkirk Error Codes
,E28,E40,E50,E160,E321,and E431 -Indicate possible faulty components. 53 - Indic
, 78 and 92 - Indicates possible wrong calibration, a new calibration is needed.
,E135 - Indicate the gas supply has been interrupted, ignition has failed or fla
,E 133, E 134,E 135, E 09,E 15,E 128 and E 384 - are displayed it is possible to
Gas Valve Connection Cable 日 10 External Probe Fault 12 Water Flow Switch Open 1
Water Refill Enabled E 19 Max Time Of Water Refill 20 Central Heating Flow NTC F
Flue NTC Fault E40 Central Heating Return NTC Fault Hot Water NTC Fault (tank ve
PCB to be set by the "Calibration Function" E 171 Fan parameter Out of range in
87 Communication error E92 Combustion test alarm during auto-setting E 1 109 Pre
E11 between the supply and return temperatures too Sensor not/poorly connected N
Temperature of heat exchanger is above the normal range (high- limit thermostat
5 burner start-up failures that the air inlet and exhaust flue are not blocked C
Sources: dunkirk.com