Utica Dunkirk E01 Error Code
The safety parameters are incorrect Bad connection PSU defective Check the wirin
Source: dmg-240__utdu-dmg-240-iom.pdf
What does Utica Dunkirk E01 mean?
E01 on the Utica-Dunkirk DMG-240 condensing boiler indicates that the safety parameters stored on the PSU (parameter storage unit) PCB are incorrect or corrupted. The control board reads a configuration value that does not match a valid operating profile for this boiler, and locks out immediately because an incorrectly configured boiler could operate outside safe limits.
Symptoms
- Boiler display shows E01 immediately on power-up
- Boiler does not attempt ignition sequence
- Fault persists after manual reset
- Often appears after a PCB replacement or power surge
Common causes
- PSU PCB recently replaced with an incorrect or unconfigured unit
- Parameter data in PSU EEPROM corrupted by power surge or PCB defect
- Loose or intermittent wiring connection to the PSU PCB
- Wrong PSU PCB variant installed for this boiler model
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Diagnostic steps
Inspect wiring connections to the PSU PCB
Remove power and reseat all connectors to the PSU PCB. An intermittent connection causes the main board to read invalid parameter values.
Verify the PSU PCB part number
Confirm the installed PSU PCB is the correct variant for the DMG-240 model. An incorrect PSU board will display E01 regardless of any other action.
Attempt parameter reset
Using the installer access code, attempt to reset the dF and dU parameters to factory defaults per the DMG-240 IOM parameter reset procedure.
Replace the PSU PCB if parameters cannot be restored
If the reset procedure fails to clear E01 and the part number is correct, the PSU EEPROM is corrupted. Install a new OEM PSU PCB for the DMG-240.
Run full commissioning after replacement
After PSU replacement, run the full automatic and manual calibration sequence per the IOM to correctly configure all operating parameters before returning the boiler to service.
When to call a professional
E01 indicating corrupted or incorrect safety parameters requires a licensed technician to perform the parameter restore and commissioning procedure. Incorrect parameter configuration affects combustion safety limits, modulation range, and ignition timing — errors in this work create real safety hazards. Contact Utica-Dunkirk technical service for PSU board part numbers and commissioning 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
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