MARLO MR-210-2 - 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

B
bonniejonesAug 21, 2025
What to do if a communication error is detected on my MARLO Controller?
- R
  Regina LarsonAug 22, 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.
J
Juan HendrixSep 4, 2025
How to fix a format mismatch on my MARLO Controller?
- C
  Cheryl YoungSep 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.
R
Ray MartinezSep 2, 2025
How to correct display format mismatch errors on the MARLO Controller?
- J
  Joann DorseySep 2, 2025
  To address programming errors related to display format mismatches on your MARLO Controller, program the units correctly in the Master Programming Mode.
G
Gloria SmithSep 1, 2025
How to fix programming errors related to system size on my MARLO Controller?
- B
  Brittany NortonSep 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
Alexandra TravisAug 30, 2025
What to do if my MARLO MR-210-2 shows a size error due to incorrect unit numbering?
- M
  Mark ColeAug 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.
D
Dr. Rodney KramerAug 29, 2025
How to resolve duplicate unit address errors on the MARLO MR-210-2 Controller?
- V
  vkingAug 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.
M
Michelle NewtonAug 27, 2025
What does "Com Error" mean on my MARLO MR-210-2 Controller and how to fix it?
- K
  karen94Aug 28, 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.
C
Christopher MayAug 26, 2025
How to fix a MARLO MR-210-2 Controller when no messages are displayed?
- V
  vmooreAug 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.
A
Andrew CurtisAug 25, 2025
Why is the display on my MARLO MR-210-2 Controller flashing?
- V
  Vicki WarnerAug 25, 2025
  If the MARLO Controller display is flashing or blinking, it indicates that a power outage has occurred.
J
Joshua PenaAug 23, 2025
Why is my MARLO MR-210-2 Controller showing a matching address error?
- J
  Johnny NielsenAug 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

Installation Instructions

Piping Installation

Softener Loading

Brine Tank Installation

Start-Up Instructions

Connecting Power and Verifying Settings

Steps for powering the controller and confirming initial system settings.

User Mode Programming Flow Chart

MX III Controller Operation

Setting the Time of Day

Manually Initiating a Regeneration

How to start a regeneration cycle manually using the controller.

Single (System 4) Programming and Ranges

Master Programming Mode Flow Chart

Master Programming Guide

System Type Configuration

Valve Address Assignment

Master Programming Guide - Display and Capacity Settings

Unit Capacity Configuration

Feed Water Hardness Setting

Master Programming Guide - Regeneration Timing and Relays

Regeneration Day Override

Regeneration Time Setting

Diagnostic Mode Flow Chart

Diagnostic Programming Guide

MX-III Controller Replacement Parts

Error Codes

Troubleshooting Softener - Detected and Programming Errors

Detected Errors

Addresses issues related to communication and unit errors.

Programming Errors

Covers errors arising from incorrect programming settings.

Troubleshooting Controller

Troubleshooting Softener - Common Issues

Slight Leak to Drain

Diagnosing minor leaks from the drain connection.

Failure to Draw Brine

Troubleshooting issues preventing brine from being drawn into the system.

Diaphragm Valve Closing Issues

Diagnosing problems with diaphragm valves not closing properly.

Troubleshooting Softener - Advanced Issues

Restricted or No Drain Flow During Backwash

Diagnosing and fixing issues with drain flow during backwash.

Loss of Softening Resin

Addressing instances where resin is found in drain or service lines.

Troubleshooting Controller - Common Errors

MARLO MR-210-2 Specifications

General

Brand	MARLO
Model	MR-210-2
Category	Controller
Language	English

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