Boiler locks out with E1 code, no ignition, circulator may run briefly

Safety first: Turn off electrical power and shut off the gas supply at the manual gas cock before servicing. Allow the boiler to cool.

• Inspect burner area: Remove the burner access panel on the Utica boiler. Locate the spark igniter and flame sensor (often a combined igniter/flame rod on modern Utica condensing models).
• Clean flame sensor: Gently remove the flame sensor rod. Use fine emery cloth or a Scotch-Brite pad to clean carbon and oxidation from the rod. Do not sand excessively. Wipe with a clean dry cloth and reinstall, ensuring proper insertion depth into the burner flame.
• Check igniter gap and position: Verify the spark igniter electrodes are not cracked and are positioned per the Utica service manual (correct gap and orientation to burner). Adjust carefully if bent.
• Verify gas supply: Confirm the manual gas shutoff valve to the boiler is fully open. If other gas appliances are not working, contact your gas supplier.
• Check gas valve wiring: Inspect the harness from the control board to the gas valve for loose connectors or damaged insulation. Reseat connectors firmly.
• Reset and test: Restore power and gas. Reset the boiler (follow Utica control instructions, usually pressing the reset button or cycling power). Observe ignition sequence through the sight glass. If the boiler lights and stays on, monitor for several cycles.
• If E1 returns: Gas pressure, combustion setup, or the ignition control module may be faulty. These require combustion test equipment and should be handled by a licensed technician.