Riello Combustion Instability

Boiler or flue emits unusual rumbling or roaring noise during firing

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 burner air/fuel ratio, Blocked burner head or diffuser disc, Worn oil nozzle (oil models), Flue restriction causing backpressure

Safety: Abnormal combustion can produce dangerous fumes. Turn off the boiler and do not use it until checked.

Visual flue check: Ensure the flue terminal is clear and undamaged.
Do not adjust burner: Do not attempt to change burner settings yourself. Incorrect adjustment can be hazardous.
Professional burner service: A Riello-trained engineer should clean the burner head, replace the oil nozzle if fitted, check combustion with an analyser, and adjust the air shutter and fuel pressure.

Professional Required 5/5

Riello Burner Assembly

Check Price on Amazon

We may earn a commission from links on this page.