Laars Flow Restriction or Gas Flow Noise

Boiler or nearby piping emits a whistling or high-pitched noise 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

Partially closed isolation valve, Clogged strainer or filter, High velocity through undersized piping, Gas pressure or orifice issues at burner

How to Fix / Troubleshooting

Safety first: If the noise seems to come from the gas valve or burner and you smell gas, shut off gas and call a professional immediately.

  • Check water valves: Ensure all boiler and system isolation valves are fully open.
  • Clean strainers: If your Laars boiler has a system strainer, isolate and clean it.
  • Observe burner: If the whistling coincides with burner firing and seems from the combustion area, do not attempt adjustments yourself.

When to call a professional: Gas flow or burner noise requires a combustion specialist to adjust orifices and pressures.

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Repair Difficulty

Medium 3/5

Required Part

System Strainer
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