Saunier Duval Delayed Ignition / Burner Light-Back

Furnace starts then shuts down after a few seconds with a loud whoosh or boom

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

Incorrect gas pressure or mixture,Dirty burner or injectors,Incorrect electrode position,Slow-opening gas valve

Critical safety warning: Delayed ignition can damage the appliance and flue. Only a licensed gas technician should adjust combustion components.

Shut down appliance: Do not continue to operate the furnace if loud ignition noises occur.
Burner cleaning: A technician should remove and clean the burner and injectors.
Check electrode gap and position: Adjust according to Saunier Duval specifications.
Gas pressure and valve check: Verify inlet and burner pressures and replace the gas valve if it is slow to open.

Professional Required 5/5

Burner Assembly

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