Utica Dunkirk E09 Error Code
Gas Valve Connection Cable 日 10 External Probe Fault 12 Water Flow Switch Open 1
Source: dcc-115__utdu-dcc-115-dcc-205-dcb-75-dcb-165-iom.pdf
What does Utica Dunkirk E09 mean?
E09 on Utica-Dunkirk DCC/DCB condensing boilers signals a gas valve connection cable fault — the PCB detects a wiring or communication problem in the circuit between the control board and the gas valve. The boiler locks out immediately because it cannot verify the gas valve's commanded state, which is a mandatory safety condition.
Symptoms
- Boiler display shows E09 and shuts down
- Burner fails to ignite or shuts off immediately
- No heating or hot water output
- Fault recurs immediately after reset attempts
Common causes
- Disconnected or poorly seated wiring plug at the gas valve
- Broken or chafed wire in the harness between PCB and gas valve
- Corroded or damaged connector pins at the PCB header
- Defective gas valve solenoid coil causing open circuit
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Diagnostic steps
Inspect the gas valve wiring harness
Locate the gas valve wiring connector and firmly reseat the plug. Tug each wire gently at the connector to check for broken crimps.
Check PCB connector for damage
Inspect the gas valve cable connection header on the PCB for bent pins, corrosion, or melted insulation from heat exposure.
Test gas valve solenoid resistance
Disconnect the gas valve connector and measure coil resistance with a multimeter. An open reading (infinite resistance) indicates a failed solenoid requiring valve replacement.
Reset the boiler
After correcting any wiring issue, press and hold the RESET button for at least 2 seconds and observe whether E09 clears.
Replace the PCB if fault persists
If wiring and gas valve check out electrically, the PCB gas valve output circuit may have failed. Contact Utica-Dunkirk technical service at 1-800-325-5479 for PCB replacement guidance.
When to call a professional
If the wiring connections are intact and the gas valve solenoid tests within specification but E09 persists, PCB replacement and recalibration is required. Both gas valve and PCB replacement must be performed by a licensed technician — gas valve work falls under gas-fitting regulations and the PCB must be commissioned using the full calibration procedure to restore proper combustion control.
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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
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
False flame signal Ignition transformer defective Gas valve defective valve and
Sources: dunkirk.com, uticaboilers.com