Miller
Venting Restriction or Resonance
Furnace is very noisy in the flue or vent pipe, 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
Partially blocked vent, Improper vent sizing, Loose vent joints, Excessive condensate in vent
How to Fix / Troubleshooting
Safety: Turn off power and gas before disassembling vent components. Venting must be reassembled according to Miller and code requirements.
- Inspect vent termination: Check outside for obstructions such as nests, leaves, or snow. Clear any blockage.
- Check vent joints: Ensure all vent sections are properly seated and secured with screws. Seal joints as specified by Miller (e.g., high-temp silicone for certain models).
- Drain condensate: On condensing models, verify that condensate is not pooling in horizontal vent sections. Correct slope and clear drains.
- Professional vent sizing review: If noise persists, have a technician verify that vent diameter and length meet Miller installation specifications.
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Repair Difficulty
Medium
3/5
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