Lochinvar Combustion Instability / Improper Gas-Air Mixture

Lochinvar water heater burner is very noisy, with roaring or whistling sound during operation.

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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

Incorrect gas pressure, Blocked burner orifices, Improper venting causing draft issues, Damaged burner assembly

How to Fix / Troubleshooting

Safety: Turn off gas and power. Combustion issues can lead to carbon monoxide; ensure adequate ventilation and use a CO detector.

Steps:

  • 1. Inspect burner: Remove the burner and clean ports and orifices with a soft brush and compressed air. Do not enlarge orifices.
  • 2. Check venting: Verify intake and exhaust vent lengths, diameters, and terminations meet Lochinvar specifications. Correct any restrictions or improper slopes.
  • 3. Professional gas adjustment: Have a licensed technician measure and adjust gas pressure and combustion using a combustion analyzer.
  • 4. Replace damaged burner: If the burner is warped, cracked, or corroded, replace it with the correct Lochinvar burner assembly.
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Repair Difficulty

Hard 4/5

Required Part

Burner Assembly
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