Display shows HiFlow or High Flow alarm during heavy water use

Safety first: Do not disassemble plumbing under pressure. Close the main shutoff if you need to modify piping.

Step-by-step checks:

• 1. Identify high-demand fixtures: Note which fixtures are in use when HiFlow appears (irrigation, multiple showers, etc.). Reduce simultaneous demand if possible.
• 2. Verify meter size setting: Confirm the programmed meter size matches the installed Marlo meter. An undersized setting can cause false HiFlow alarms.
• 3. Check for restrictions: Inspect downstream valves and filters for partial closure or clogging that could increase velocity through the meter.
• 4. Inspect for cross-connections: Ensure there is no unsoftened bypass line tied into softened plumbing that could create unusual flow patterns.

When to replace parts: If the meter is undersized for the actual flow, upgrade to a larger Marlo flow meter assembly as specified by Marlo for your flow requirements.