Carrier Water Hammer in Humidifier Supply Line

Whole-home Carrier humidifier makes loud banging or water hammer noises when starting or stopping.

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.

Possible Causes

High water pressure, Fast-closing solenoid valve, Rigid copper line without hammer arrestor, Loose pipe supports

Safety first: Shut off water supply before modifying plumbing.

Steps:

1. Secure piping: Ensure the humidifier water line is firmly strapped to framing to reduce movement.
2. Install hammer arrestor: Add a small water hammer arrestor near the humidifier solenoid valve.
3. Reduce pressure: If household water pressure is very high (>80 psi), consider installing or adjusting a pressure-reducing valve.

Medium 3/5

Humidifier Water Solenoid Valve

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