3M ScaleGard HP, Installation And Operation Instructions Manual

17

Troubleshooting Guide

Problem

Possible Cause

Solution

Notes

Unit Runs Low or Out of Water

Undersized tank for store demand

Install additional storage tank capacity

Contact Dealer

RO production is to low for store 
demand

Install RO add-on head and cartridge

Contact Dealer

Upgrade from HFRO 500 to HFRO 700 
Cartridge

Slow leak in the distribution line

Repair leak

The unit produced RO water slowly. A dripping leak 
can prevent the tank from fi lling.

RO membrane fl ow control 
improperly installed or missing

Properly install RO membrane fl ow control

Note: Reference RO cartridge change-out 
instructions

System shuts down and "service" 
indicator light turns on blinking

Pre-Filter plugs left hand gauge 
reads less than 90

Replace Pre-Filter

—

Wait for 10-60 minutes to see if system 
restarts

Low production rate

Replace RO membrane

RO membrane fouls, low 
production

System shuts down and “service” 
indicator light turns on solid

Pre-Filter plugs left hand gauge 
reads less than 90

Replace Pre-Filter

A more frequent schedule change-out 
may be needed (Refer to Challenge Water 
Recommendations on page 6)

RO membrane fouls (normal 
conditions)

Replace RO membrane

Check for: 1. feedwater pressure, 2. production 
fl ow rate, 3. drain fl ow rate before replacing RO 
membrane

Ensure drain line is not kinked or plugged.
Replace if needed.

RO membrane fouls (high feed 
water hardness/TDS)

Install RO add-on head and cartridge

Contact Dealer

Install a HFRO 33% Recovery Kit

Install water softener upstream

RO membrane fouls (high particle 
load in incoming water)

Install prefi lter and RO expansion heads and 
cartridges

Interrupted feedwater supply

Press Reset button on top of electrical 
enclosure

Reference system startup procedure

Water temperature below 50 

°

F

Install RO expansion head and cartridge

Low feedwater pressure (below 
30 psi)

Contact plumber to resolve problem

Reference system startup procedure once low feed 
water problem is resolved

Iron or Manganese in incoming 
water

Contact your dealer/distributor to install 
specifi c iron or manganese reduction system

TDS of product water too low

Blend too low

Re-adjust blending valve to allow more 
blending

Reference Blending Valve Adjustment

TDS of product water too high

Blend to high

Re-adjust blending valve to allow less blending

Reference Blending Valve Adjustment

TDS of product water too high with 
no blending 

RO membrane needs to be 
replaced

Replace RO membranes

—

TDS monitor not operating

Low battery

Replace TDS monitor batteries

—

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