Display shows LowPSI or Low Pressure; regeneration may abort

Safety first: Use caution when opening plumbing. Depressurize the system if removing screens or fittings.

Step-by-step checks:

• 1. Measure pressure: Attach a pressure gauge to a nearby hose bib or test port. Confirm that pressure meets Marlo's minimum requirement (typically 20–25 psi or higher).
• 2. Check inlet valve and bypass: Ensure the Marlo bypass is fully in service position and that any upstream shutoff valves are fully open.
• 3. Inspect inlet screen: Remove the inlet screen or filter on the Marlo valve (if equipped). Clean sediment and debris, then reinstall.
• 4. Evaluate well or booster system: If on a well, verify that the pump and pressure tank are functioning correctly. Low system pressure must be corrected at the source.

When to replace parts: Replace a damaged or corroded Marlo inlet screen or pre-filter cartridge if cleaning does not restore flow.