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MARLO MR-300-3 - User Manual

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MR 150M–1050M
SINGLE – SYSTEM 4
MX-III CONTROLLER
COMMERCIAL WATER CONDITIONERS
INSTALLATION, OPERATION,
AND MAINTENANCE MANUAL
MODEL NO:
SERIAL NO:
DATE INSTALLED:
DEALER:
COMPLETE FOR FUTURE REFERENCE:
Marlo Incorporated
2227 South Street
P.O. Box 044170
Racine, WI 53404-7003
www.Marlo-Inc.com
A2170381 8-313 R3
FOR MODELS MANUFACTURED
FROM OCTOBER 2017

Table of Contents

Questions and Answers

  • M
    Mary SmithAug 21, 2025
    What to do if a communication error is detected on my MARLO MR-300-3?
    • M
      melissa46Aug 21, 2025
      A communication error with the MARLO Controller could be due to missing or faulty communication cables. Ensure all communication cables are properly connected and replace any that are damaged. Another cause may be that the communication cables are plugged into the wrong receptacle. Refer to the wiring diagrams to connect the cables correctly. Also, ensure all units are powered on, as a lack of power to one or more units can cause this error.
  • C
    Christopher JonesSep 4, 2025
    How to fix a format mismatch on my MARLO MR-300-3?
    • K
      Kimberly JohnsonSep 4, 2025
      To resolve a format mismatch on your MARLO Controller where units have both U.S. and Metric formats, verify that all units have the same format selected, either all U.S. or all Metric.
  • D
    Dr. Jordan Cox IIISep 2, 2025
    How to correct display format mismatch errors on the MARLO MR-300-3 Controller?
    • A
      ashley28Sep 3, 2025
      To address programming errors related to display format mismatches on your MARLO Controller, program the units correctly in the Master Programming Mode.
  • B
    Brianna RobinsonSep 1, 2025
    How to fix programming errors related to system size on my MARLO MR-300-3 Controller?
    • C
      Christopher WeeksSep 1, 2025
      To resolve programming errors related to the size of the system on the MARLO Controller, program the units correctly in the Master Programming Mode.
  • A
    Angela MooreAug 30, 2025
    What to do if my MARLO MR-300-3 Controller shows a size error due to incorrect unit numbering?
    • S
      Steven Johnson MDAug 31, 2025
      To correct a size error on your MARLO Controller where units are not correctly numbered or multiple units have the same number, check each unit to verify it has the correct number and that no other unit shares that number.
  • M
    Mrs. Tracey RushAug 29, 2025
    How to resolve duplicate unit address errors on the MARLO MR-300-3?
    • P
      perezmichaelAug 29, 2025
      To resolve programming errors related to duplicate unit addresses or numbers on the MARLO Controller, program the units correctly in the Master Programming Mode.
  • D
    David YoungAug 27, 2025
    What does "Com Error" mean on my MARLO Controller and how to fix it?
    • X
      xreeseAug 27, 2025
      A "Com Error" on your MARLO Controller indicates a communication error. To resolve this, check the system's wiring to ensure it is correct and that all connections are secure.
  • J
    Jacob GatesAug 27, 2025
    How to fix a MARLO MR-300-3 Controller when no messages are displayed?
    • M
      Michael BondAug 27, 2025
      If your MARLO Controller displays no messages or shows small black squares, adjust the contrast button located on the back of the unit until the text becomes visible.
  • T
    tonya21Aug 25, 2025
    Why is the display on my MARLO Controller flashing?
    • M
      monroesierraAug 25, 2025
      If the MARLO Controller display is flashing or blinking, it indicates that a power outage has occurred.
  • C
    Christopher CruzAug 23, 2025
    Why is my MARLO MR-300-3 Controller showing a matching address error?
    • V
      veronicawallaceAug 23, 2025
      The most likely cause of a matching address error in your MARLO Controller is having two or more units programmed with the same unit number. To resolve this, ensure that each unit has a unique unit number.

Summary

Commercial and Industrial Product Warranty

Commercial and Industrial Water Softener Guarantee

Specification Chart

Wiring Diagram

Installation Instructions

General Information

Overview for installation procedures and component identification.

Softener Loading

Instructions for loading the tank with gravel and resin.

Brine Tank Installation

Procedures for installing and leveling the brine tank.

Piping Installation

Details the procedures for connecting the water and drain lines.

Gravel Loading - (Load First)

Step-by-step guide for loading gravel into the softener tank.

Resin Loading

Steps for properly loading the resin into the softener tank.

Start-Up Instructions

General Softener Operation

How the Stager Functions

Flow Diagram - Water Softeners

Brine Maker Operation

Features of the MX III Controller

User Mode Programming Flow Chart

MX III Controller Operation

Setting the Time of Day

Manually Initiating a Regeneration

Steps to manually start a regeneration cycle.

MX III Controller Operation

Controller Operation During a Power Failure

Single (System 4) Programming and Ranges

Master Programming Mode Flow Chart

Master Programming Guide

2. System Type

3. Valve Address

Master Programming Guide

5. Regeneration Type

10. Unit Capacity

6. Valve Type

7. Regenerant Flow

12. Feed Water (Hardness)

15. Regeneration Cycle Steps

Diagnostic Mode Flow Chart

Diagnostic Programming Guide

Overview Diagnostic Mode

Explains how to navigate and view diagnostic information.

MX-III Controller Replacement Parts

Replacement Valves

Aquamatic Repair Kits

Error Codes

Troubleshooting Softener

Detected Errors

Steps to resolve common detected errors in the system.

Programming Errors

Guidance for addressing errors related to unit programming.

Troubleshooting Controller

Example Error Screens

Visual examples of controller error messages and their solutions.

Troubleshooting Softener

Common Leaks and Flow Issues

Diagnosing and resolving leaks and flow problems.

Hard Water Leakage and Drain Flow Issues

Addressing hard water leaks and drain flow problems.

Brine Draw and Valve Issues

Troubleshooting brine draw and diaphragm valve malfunctions.

Loss of Softening Resin

Diagnosing and resolving issues related to softening resin loss.

Troubleshooting Controller

Communication and Configuration Errors

Display and Message Errors

MARLO MR-300-3 Specifications

General IconGeneral
BrandMARLO
ModelMR-300-3
CategoryController
LanguageEnglish

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