Utica Dunkirk E17 Error Code
Problem on SU PCB Bad connection Defective SU PCB Check the wiring Inspect the S
Source: dmg-240__utdu-dmg-240-iom.pdf
What does Utica Dunkirk E17 mean?
E17 on the Utica-Dunkirk DMG-240 condensing boiler indicates a problem with the SU (safety unit) PCB — either the board has failed internally, or its connection to the main PCU (process control unit) PCB has been interrupted. The SU PCB handles critical safety functions including ignition, flame supervision, and high-limit monitoring; its failure causes an immediate boiler lockout.
Symptoms
- Boiler display shows E17 and enters lockout immediately
- Burner does not attempt ignition
- Boiler cannot be reset or fault clears only momentarily
- No other error codes present that explain a functional fault
Common causes
- Loose or disconnected wiring between the SU PCB and the main PCU PCB
- SU PCB internal failure or component damage
- Wrong SU PCB installed for the specific boiler model
- Moisture or condensate contamination on the SU PCB
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Diagnostic steps
Inspect wiring connections to the SU PCB
With power removed, locate the SU PCB and check that its harness connectors are fully seated. Reseat each connector firmly and inspect for damaged pins or burned insulation.
Verify the SU PCB is correctly seated in its connector
The SU PCB mounts into a connector on the PCU PCB. Confirm it is fully inserted and locked into its mounting position without any visible tilt or misalignment.
Inspect for moisture or contamination
Look for water staining, corrosion, or condensate on the SU PCB. If condensate ingress is present, dry the board and address the source of moisture before retesting.
Verify the SU PCB part number matches the boiler model
Confirm the installed SU PCB is the correct variant for this boiler. An incorrect SU PCB will display E17 and cannot be corrected by any user action.
Replace the SU PCB if fault persists
If wiring and seating checks do not clear E17, the SU PCB has failed internally. Order the correct OEM replacement and install per the DMG-240 IOM service instructions.
When to call a professional
SU PCB replacement requires access to live electrical components inside the boiler cabinet and must be followed by a full boiler commissioning sequence including combustion calibration. Only a licensed HVAC technician should replace the SU PCB to ensure correct part selection, proper installation, and safe re-commissioning per the manufacturer's service documentation.
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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