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Barbara Walker DDSSep 8, 2025
Why is my MARLO MR-300-3 Controller failing to draw brine?
- ZzmurraySep 8, 2025
If your MARLO Controller fails to draw brine, check the water pressure. It must be at least 30 psi during regeneration.
Why is my MARLO MR-300-3 Controller failing to draw brine?
If your MARLO Controller fails to draw brine, check the water pressure. It must be at least 30 psi during regeneration.
Why is my MARLO MR-300-3 Controller showing a matching address error?
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.
Why is the display on my MARLO Controller flashing?
If the MARLO Controller display is flashing or blinking, it indicates that a power outage has occurred.
How to fix a MARLO MR-300-3 Controller when no messages are displayed?
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.
What does "Com Error" mean on my MARLO Controller and how to fix it?
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.
What causes loss of softening resin and gravel in service lines in MARLO MR-300-3?
To resolve a loss of softening resin with evidence of resin and/or gravel in the service lines of your MARLO Controller, check for damage to the softener under-drain system.
What to do if the diaphragm valve does not close completely on my MARLO MR-300-3?
If the diaphragm valve on your MARLO Controller does not close or seat completely, check that the vent hole is not plugged.
What to do if the diaphragm valve does not open on my MARLO Controller?
If the diaphragm valve on your MARLO Controller does not open, check that the vent hole is not plugged.
What causes high flow to drain during service in MARLO MR-300-3?
If there is high flow to the drain during service with your MARLO Controller, check the position dial. If it is not in position #4, rotate the stager clockwise to this position.
How to fix a format mismatch on my MARLO MR-300-3?
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.
Overview for installation procedures and component identification.
Instructions for loading the tank with gravel and resin.
Procedures for installing and leveling the brine tank.
Details the procedures for connecting the water and drain lines.
Step-by-step guide for loading gravel into the softener tank.
Steps for properly loading the resin into the softener tank.
Steps to manually start a regeneration cycle.
Explains how to navigate and view diagnostic information.
Steps to resolve common detected errors in the system.
Guidance for addressing errors related to unit programming.
Visual examples of controller error messages and their solutions.
Diagnosing and resolving leaks and flow problems.
Addressing hard water leaks and drain flow problems.
Troubleshooting brine draw and diaphragm valve malfunctions.
Diagnosing and resolving issues related to softening resin loss.
General| Brand | MARLO |
|---|---|
| Model | MR-300-3 |
| Category | Controller |
| Language | English |