ACV Flue Gas Leakage

Smell of flue gases or combustion products near the water heater

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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

Loose ACV flue connections, Cracked flue pipe, Failed flue gasket at boiler collar, Blocked flue causing spillage

How to Fix / Troubleshooting

Safety: Flue gas contains carbon monoxide. If you suspect a leak, shut down the heater immediately, ventilate the area, and do not use the appliance until it is checked.

  • 1. Visual inspection: Check all visible flue joints and the connection to the ACV heater for gaps, cracks, or signs of soot.
  • 2. Tighten joints: Reseat and tighten any loose clamps or locking bands on the flue system. Replace damaged gaskets with ACV-approved parts.
  • 3. Check terminal: Ensure the flue terminal is not blocked and has correct clearances.
  • 4. Professional test: Have a qualified technician perform a flue integrity and combustion analysis test.

Do not operate the heater until flue gas leakage has been fully resolved.

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Repair Difficulty

Hard 4/5

Required Part

Flue System / Flue Gaskets
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