3M 5636201, Installation Manual

10

Troubleshooting Guide

Problem

Cause

Solution

Notes

Unit never 

produces RO 

water/only 

provides bypass 

water

Low Feed Water 

Pressure

Repair existing 

Booster Pump

Contact Dealer

Add Water Booster 

Pump

Only if Booster Pump 

is not installed.

Unit Runs Low  

or Out of Water

Low Feed Water 

Pressure

Repair Existing 

Booster Pump / 

System  

(If Applicable) 

Contact Dealer

Add Water Booster 

Pump

Only if Beverage 

Booster System is not 

installed

RO Membrane 

Fouled

Replace RO 

Membrane

Feed Water Pressure, 

Temperature, RO 

Membrane Flow Rate 

should be checked 

before replacing 

Membrane

Storage Tank Air 

Charge is Low

Drain Tank using 

Sample Valve, with 

Sample Valve Open, 

Pump Up Air Charge, 

8 to 10 psi, Close 

Sample Valve

Unscrew Blue Cap to 

Access Schrader Air 

Valve

Pre-Filter is 

Plugged by 

Sediment 

(Particles)

Replace Pre-Filter

A more frequent 

pre-filter change-out 

schedule may be 

needed or use  

HF60-CL or HF90-

CL for high sediment 

load area

Slow Leak In the 

Distribution Line

Repair Leak

The unit produces 

water slowly. A 

dripping leak can 

prevent the tank from 

filling

Unit Never Shuts 

Off (Continually 

Runs to Drain)

RO Membrane 

Partially Fouled, 

Unit cannot 

produce enough 

water to keep up 

with demand

Replace RO 

Membrane

High levels of 

hardness minerals 

may be present in 

feed water, monitor 

reject flow for 

plugging, contact 

dealer to add a water 

softener

Product water 

check valve, 

within the RO 

Membrane 

allowed storage 

tank to flow 

backwards to 

drain

Check Reject Water 

flow to drain in the 

morning. Unit should 

be off and no flow 

to drain. If flow to 

drain exists, turn off 

the feed water valve 

and check for flow to 

drain in 10 minutes. If 

flow to drain remains 

steady, replace RO 

Membrane.

Reject Water flow 

to drain should stop 

when the feed water 

valve is off.