Glow-worm Gas flow resonance / fan or flue noise

Furnace emits a whistling or high-pitched noise during operation

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 valve setting, Partially blocked burner on Glow-worm furnace, Flue restriction or poor terminal location, Worn fan bearings

Safety: Any unusual combustion noise should be investigated by a qualified engineer.

User checks:

Ensure flue terminal is clear of obstructions and not enclosed by new structures or foliage.

Technician steps:

Perform a combustion analysis and adjust gas valve settings as per Glow-worm data.
Inspect and clean the burner for debris or corrosion.
Check the fan for bearing noise and replace if worn.
Verify flue installation and correct any issues with length, bends, or terminal position.

Hard 4/5

Burner Assembly / Fan

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