Thermia Vent Noise / Resonance

Furnace is very noisy in the flue or vent pipes, with whistling or roaring sounds.

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Safety Warning

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.

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Possible Causes

Improper vent sizing, Excessive vent length, Sharp elbows near Thermia furnace, Partially blocked vent termination

How to Fix / Troubleshooting

Safety first: Turn off power and gas if you suspect vent blockage.

  • 1. Inspect vent termination: Check outside terminations for obstructions such as ice, snow, or debris. Clear as needed.
  • 2. Check vent supports: Ensure vent pipes are properly supported and not vibrating against framing.
  • 3. Review vent layout: Compare vent length, diameter, and number of elbows to Thermia installation guidelines. Excessive length or tight bends can cause noise and performance issues.
  • 4. Professional correction: A technician may need to reconfigure venting to reduce noise and ensure safe operation.
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Repair Difficulty

Hard 4/5

Required Part

Exhaust Vent Piping
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