Aprilaire
Water Hammer in Supply Line
Aprilaire humidifier makes loud banging or water hammer noise when turning on or off
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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
Fast-closing solenoid valve, High water pressure, Rigid copper line without hammer arrestor, Loose water piping near humidifier
How to Fix / Troubleshooting
Safety first: Shut off water supply before modifying plumbing.
- Secure piping: Check that the water line feeding the humidifier is firmly strapped to framing. Add pipe clamps where needed to reduce movement.
- Install hammer arrestor: Add a small water hammer arrestor near the humidifier solenoid on the supply line to absorb shock.
- Reduce pressure: If household water pressure is above 80 psi, install or adjust a pressure-reducing valve on the main supply.
- Use flexible tubing: Replace a long rigid copper run with approved flexible tubing to absorb some of the shock.
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Repair Difficulty
Medium
3/5
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