Marlo
Hydraulic Shock / Rapid Valve Transition
Softener causes water hammer or banging pipes when starting or ending regeneration
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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
High inlet pressure, Rapid closing of Marlo valve ports, Lack of water hammer arrestors, Undersized or loose plumbing
How to Fix / Troubleshooting
Safety first: Use caution when adjusting pressure regulators or modifying plumbing. Shut off water before cutting pipes.
Step-by-step checks:
- 1. Measure pressure: Use a gauge to check static and dynamic pressure. If above Marlo's recommended maximum, adjust or install a pressure reducing valve.
- 2. Secure plumbing: Ensure pipes near the softener are properly strapped and supported to reduce movement.
- 3. Install hammer arrestors: Add water hammer arrestors near quick-closing valves or at the softener inlet/outlet if hammer persists.
- 4. Check valve programming: On some advanced Marlo controllers, you may be able to adjust cycle transition times. Consult the manual.
When to replace parts: If internal valve components are damaged from repeated hammer, replace the Marlo control valve assembly as needed.
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Repair Difficulty
Medium
3/5
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