Herz Combustion Resonance / Gas Flow Noise

Boiler produces a whistling or high-pitched 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 gas pressure at Herz gas valve, partially blocked injector, resonance in flue system, loose burner gasket

Safety: Combustion adjustments must be done by a gas-safe technician.

Check flue fixings: Ensure all flue joints and brackets are secure and not vibrating.
Inspect burner seal: Verify that the burner door gasket on the Herz boiler is intact and evenly compressed.
Technician gas check: Have a Herz technician measure inlet and burner pressure and adjust or clean the injector if necessary.

Hard 4/5

Herz burner gasket

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