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MARLO MR-900-3 - 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

  • E
    Elijah BrownAug 21, 2025
    What to do if a communication error is detected on my MARLO Controller?
    • T
      Tina NicholsonAug 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.
  • M
    Michael ParkerSep 4, 2025
    How to fix a format mismatch on my MARLO Controller?
    • C
      Christopher RodriguezSep 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.
  • J
    Justin SmithSep 2, 2025
    How to correct display format mismatch errors on the MARLO MR-900-3?
    • J
      James GonzalezSep 2, 2025
      To address programming errors related to display format mismatches on your MARLO Controller, program the units correctly in the Master Programming Mode.
  • C
    Catherine FrenchSep 1, 2025
    How to fix programming errors related to system size on my MARLO MR-900-3?
    • M
      Matthew PottsSep 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.
  • K
    Kelly JonesAug 30, 2025
    What to do if my MARLO MR-900-3 shows a size error due to incorrect unit numbering?
    • J
      Jenna DoyleAug 30, 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.
  • C
    Christopher TaylorAug 29, 2025
    How to resolve duplicate unit address errors on the MARLO MR-900-3 Controller?
    • C
      Caitlin TurnerAug 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.
  • A
    Amy JordanAug 27, 2025
    What does "Com Error" mean on my MARLO Controller and how to fix it?
    • J
      John WrightAug 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.
  • S
    Sarah GutierrezAug 26, 2025
    How to fix a MARLO MR-900-3 when no messages are displayed?
    • S
      Susan KingAug 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.
  • M
    Michael ScottAug 25, 2025
    Why is the display on my MARLO Controller flashing?
    • L
      lopezmichelleAug 25, 2025
      If the MARLO Controller display is flashing or blinking, it indicates that a power outage has occurred.
  • P
    Peter MorrisonAug 23, 2025
    Why is my MARLO MR-900-3 Controller showing a matching address error?
    • K
      Kelli ColonAug 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

System Information

Specification Chart

Wiring Diagram

Electrical schematic showing controller and component connections.

Installation

Piping Installation

Softener Loading

Brine Tank Installation

Operation

Start-Up Instructions

Step-by-step guide for initial system startup and controller configuration.

Softener Operation and Brine Maker

Controller Features and User Mode

Controller Operation and Display

Programming Parameters and Ranges

Details System 4 and Master programming parameters and ranges.

Troubleshooting

Error Codes

List of error messages, their causes, and corrective actions.

Troubleshooting Controller

Solutions for detected errors and programming issues.

Troubleshooting Softener

Procedures for diagnosing and resolving common softener operational issues.

MARLO MR-900-3 Specifications

General IconGeneral
BrandMARLO
ModelMR-900-3
CategoryController
LanguageEnglish

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