Utica Dunkirk E55 Error Code
PCB to be set by the "Calibration Function" E 171 Fan parameter Out of range in
Source: dcc-115__utdu-dcc-115-dcc-205-dcb-75-dcb-165-iom.pdf
What does Utica Dunkirk E55 mean?
E55 on Utica-Dunkirk DCC/DCB condensing boilers means the PCB control board is not programmed or has not been calibrated. This fault appears after a PCB replacement when the new board has not yet had the automatic calibration function run, or when calibration data stored on the board has been corrupted or lost. The boiler will not fire until calibration is completed.
Symptoms
- Boiler display shows E55 after a PCB replacement
- Boiler will not ignite or attempt to fire
- E55 may appear during or after a failed calibration attempt
- All other electrical functions appear normal
Common causes
- PCB replaced without running the commissioning calibration function
- Calibration data erased from PCB memory (power surge or PCB defect)
- Automatic calibration sequence interrupted before completion
- Incorrect PCB installed for the specific boiler model
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Diagnostic steps
Confirm the correct PCB is installed
Verify the replacement PCB part number matches the boiler model. An incorrect board will display E55 and cannot be calibrated.
Open all heating zones
Before running calibration, ensure all zone valves are open and at least one thermostat is calling for heat to provide maximum flow and prevent overheating shutdown during the sequence.
Run the automatic calibration function
Press and hold both navigation buttons simultaneously for 6 seconds until the display shows 'On.' The calibration sequence runs through three power levels (maximum, ignition, and minimum) and takes approximately 3–5 minutes.
Perform manual calibration
Immediately after automatic calibration, enter manual calibration mode and verify CO2 at minimum, ignition, and maximum power using a combustion analyzer. Adjust as needed per section 9.9 of the IOM.
Verify E55 clears and boiler fires normally
Once calibration completes successfully, E55 should clear. Run a full heating cycle and verify stable burner operation with no recurring faults.
When to call a professional
PCB calibration requires a combustion analyzer to verify CO2 concentrations at all three firing rates during manual calibration. This is a mandatory step that a technician must complete — improper calibration leads to inefficient combustion, elevated CO production, and potential safety hazards. Contact Utica-Dunkirk technical service at 1-800-325-5479 for assistance.
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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
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
False flame signal Ignition transformer defective Gas valve defective valve and
Sources: dunkirk.com, uticaboilers.com