Fafco Hydraulic Shock in Solar Plumbing

Water hammer or banging noises occur in pipes when solar turns on or off.

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

Valve actuator switching too quickly, No slow-opening check valve, High pump flow with sudden stop, Air pockets collapsing in vertical risers

Safety: Avoid standing directly over pipes that are moving or banging.

Adjust valve timing: Some Fafco controllers allow delay or soft-start settings; enable these if available.
Install water hammer arrestor: Add an arrestor or cushioning device on the solar feed line near the equipment pad.
Bleed air: Ensure the vacuum relief valve is working and that the system fills smoothly without large air pockets.
Throttle flow: Slightly close a valve to reduce peak flow if the pump is oversized, while still maintaining adequate panel flow.

Medium 3/5

Fafco Solar Feed Plumbing

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