NTI Delayed Ignition

Boiler ignites with a loud boom or pop sound

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Dirty burner, Incorrect gas pressure, Misaligned ignition electrode, Slow opening gas valve

Safety: Delayed ignition can damage the boiler. Shut it down and do not repeatedly reset.

Inspect and clean burner: Remove the burner and clean ports with a soft brush and vacuum.
Check ignition electrode: Verify correct gap and position per NTI specifications. Replace if cracked or worn.
Professional gas setup: Have a technician verify gas pressure and valve operation and perform combustion tuning.

Professional Required 5/5

Ignition Electrode / Burner Assembly

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