Slant/Fin Delayed Ignition

Boiler ignites with a loud boom or puff back

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 orifices, Weak igniter on Slant/Fin boiler, Incorrect ignition gap, Low primary air or blocked burner

Safety: Turn off gas and power. Delayed ignition can damage the boiler and venting.

Steps:

1. Do not continue to operate: Repeated booming can crack the heat exchanger.
2. Visual inspection: Check burner for heavy rust or debris. Do not attempt to drill or modify orifices.

Professional service: A technician must clean and adjust the burner, verify ignition timing, and check gas pressure.

Professional Required 5/5

Igniter Assembly

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