Maytag MWF4100AWS Instruction Manual

MAYTAG Whole Home Water Filtration System Owners Manual MA1-5
November 2003
1
MAYTAG Whole Home Water Filtration System
Owner’s Manual
Models:
MWF4100AWS
MWF4200AWS
MWF4300AWS
Your Operation and Maintenance Guide
Table of Contents
Dealer and System Information .................................................................. 2
IMPORTANT! READ THIS FIRST........................................ 3
Safety Instructions....................................................................................... 3
Certifications and Testing........................................................................... 7
Service .......................................................................................................... 9
Legal Disclaimer .......................................................................................... 9
Trademarks................................................................................................. 10
System Description ................................................................................... 11
Replacement Parts..................................................................................... 11
Startup of a new MAYTAG Whole Home Water Filtration System......... 12
Sanitizing Your Household Distribution System .................................... 12
Maintenance Schedule .............................................................................. 12
Replacing/Cleaning the Internal Prefilter and Cleaning the System..... 15
Replacing the External Sediment Prefilter Cartridge ............................. 19
Setting the Controller ................................................................................ 22
Choosing a Controller Program ............................................................... 23
Winterization Procedure............................................................................ 24
Annual Maintenance Checklist ................................................................. 32
Cleaning the Stainless Steel Casing ........................................................ 32
Frequently Asked Questions .................................................................... 32
Troubleshooting......................................................................................... 37
MAYTAG Whole Home Water Filtration System Operational
Specifications............................................................................................. 39
MAYTAG WHOLE HOME WATER FILTRATION SYSTEM Limited Warranty
..................................................................................................................... 40
Important: see safety warnings and cautions inside.

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MAYTAG Qualified Dealer
Model Number
Qualified Technician
Phone Number (MAYTAG Customer Care) 1-800-688-2002____________________
Emergency Customer Service Number
Membrane Module Serial Number
Backpulse Tank Serial Number
Backpulse Tank Pressure Setpoint
Installation Date
Thank you…
By purchasing the MAYTAG Whole Home Water Filtration System you have taken the first step
in providing safer, great tasting water for the entire home.
The MAYTAG Whole Home Water Filtration System is an advanced Point of Entry (POE) water
filtration system that uses ultrafilter membrane technology to provide a physical barrier to
bacteria, parasites, viruses and particles. The System requires minimal maintenance and will
provide you with years of cleaner, safer, better tasting water. Simply follow the information
found in this manual and schedule an annual maintenance visit by your MAYTAG Whole Home
Water Filtration System Qualified Dealer.
The MAYTAG Whole Home Water Filtration System should only be installed where the System
and the installation complies with provincial or state laws and local laws and regulations. The
MAYTAG Whole Home Water Filtration System conforms to ANSI/NSF 42 and 53 for the
specific performance claims as verified and substantiated by test data. The System should only be
used to filter cold water (less than 38°C (100 F)) and must be protected from freezing.
Dealer and System Information
Maytag Canada
4151 North Service Road
Burlington, Ontario
L7R 4A8
1-800-688-2002

MAYTAG Whole Home Water Filtration System Owners Manual MA1-5
November 2003
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IMPORTANT! READ THIS FIRST
• Read this manual carefully prior to use.
• Permanently locate the manual near the water filtration system.
• Periodic checks of the MAYTAG Whole Home Water Filtration System are required to ensure safe and
efficient operation.
• Annual maintenance by a MAYTAG Services Qualified Service Technician is required to validate the
limited warranty.
• Cost of annual maintenance is the Owner’s responsibility.
• Many of the tools referenced are available through your MAYTAG Qualified Dealer.
• Maintenance on the MAYTAG Whole Home Water Filtration System will mean that your house will not
have water during the maintenance procedure. If water is required for cleaning a component or any
other use during the maintenance procedure, be sure to fill enough suitable water containers before
beginning the maintenance procedure.
Using this Manual …
The following typographical conventions are used in this manual:
Start by reviewing these important safety alert symbols. These safety symbols will alert you to
the possibility of serious injury, death, or property damage.
Italics are used for emphasis.
Danger notices indicate the potential for severe injury, illness, death and/or property
damage (ie. electrocution). Read and follow all instructions.
Warnings indicate actions that could cause damage to equipment, water contamination,
severe injury, illness, death and/or property damage.
Safety Instructions
The MAYTAG Whole Home Water Filtration System has been designed and tested to offer
reliable service, provided it is installed by a MAYTAG Services Qualified Service Technician
and is operated, maintained, and tested in strict accordance with the safety instructions contained
in this manual.

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Operational Safety
• The MAYTAG Whole Home Water Filtration System is under pressure during use and
precautions must be taken.
• This device is designed to operate on a 120VAC/15 Amp/ 60Hz line. Do not modify the plug
on the power cord. If the plug does not fit the electrical outlet, have a proper outlet installed
by a qualified electrician.
• To avoid System damage: Ensure that a Stainless Steel Prefilter or Carbon Prefilter is in place
during operation of the System. In the absence of an Internal Prefilter, abrasive damage to the
System may occur. A damaged System may permit contaminated water to enter the household
distribution system causing illness. Irreversible and premature fouling of the System may also
occur resulting in System replacement at the owner’s expense.
Service and Maintenance Safety
• To avoid electric shock: Disconnect the AC power from the MAYTAG Whole Home Water
Filtration System before servicing the controller; do not remove the controller cover while
System is in use. Only MAYTAG Services Qualified Service Technicians should attempt to
service the controller.
• Important: The MAYTAG Whole Home Water Filtration System must be kept in a wetted
condition. Once installed or during service and maintenance activities, do not allow the
System to sit completely drained for extended periods (greater than 12 hours). Failure to do
so may damage the System and cause contaminated water to enter the household.

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The MAYTAG Whole Home Water Filtration System must be kept wet at all times after
installation. Failure to do so may cause System to dry and become damaged, which may
lead to personal injury, and/or physical damage and will void any warranty.
Winter Storage
• The MAYTAG Whole Home Water Filtration System will be damaged if frozen. The System
must be winterized according to the Winterization Procedure by a MAYTAG Services
Qualified Service Technician.
The MAYTAG Whole Home Water Filtration System must be winterized prior to
temperatures falling below 0°C (32 F). Failure to do so may cause System to dry, freeze
and become damaged, which may lead to personal injury, and/or physical damage and
will void any warranty.
Other Safety Precautions
• Do not plug in the Controller transformer if there is water on electrical wiring or the power
supply.
• Always shut off water flow and release water pressure before cleaning or maintaining the
System.
• The System is intended for indoor use only. The power supply and controller must not be
exposed to weather elements.
• A MAYTAG Services Qualified Service Technician must perform an Integrity Test at least
once a year.
The MAYTAG Whole Home Water Filtration System must be;
• tested annually using the integrity test.
• operated with either a Carbon or Stainless Steel Prefilter.
Failure to do so may cause System to become damaged, which may lead to personal
injury, and/or physical damage and will void any warranty.
Emergency Bypass Safety (if installed where required by local plumbing codes)
Some Systems will have a bypass valve installed. If a bypass valve is installed, your System
piping will look like Photo 1. Follow these safety precautions if your System has been installed
with an emergency bypass valve.

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Photo 1.
Bypassing the MAYTAG Whole Home Water Filtration System will result in unfiltered
water entering the household distribution system. This water may be biologically unsafe
and drinking this water could result in illness or death. Exercise caution in bypassing the
System. Do not drink water from the System while the System is in bypass mode.
If the System has been operated in bypass mode and if water is being drawn from a well
or surface water source, the household distribution system should be re-disinfected once
returned to filtration mode.
If the System is in bypass mode, the controller must be unplugged. Failure to do so
may cause System to dry and become damaged, which may lead to personal injury,
and/or physical damage and will void any warranty.
A bypass system is not required for proper operation of the MAYTAG Whole Home Water
Filtration System, however some local plumbing codes may require a bypass. If the System is to
be equipped with a bypass, the procedure below may be followed to provide water in an
emergency or System malfunction.1
1System malfunction would include a possible water leak or failed integrity test.
Photo 2a. Ball valve: open
p
osition
Photo 2b: Ball valve:
closed position

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Bypass Procedure
1. Close the Inlet and Outlet ball valves (turn handles clockwise). Ball valves are in the
closed position when the handle is positioned perpendicular to the water pipe. (See
Photo 2a and 2b on previous page.)
2. Open Bypass Valve (turn handle counter-clockwise).
3. Unplug controller.
4. To return to filtered water service, in the order listed;
• close bypass valve (turn handle clockwise)
• open inlet and outlet ball valves (turn handles counter-clockwise)
• plug in controller
Certifications and Testing
NSF (National Sanitation Foundation) Testing and Certification
NSF International is the world’s leading testing and certification laboratory for water
treatment products.
Models MWF4200AWS and MWF4300AWS:
System Tested and Certified by NSF International
against NSF/ANSI 42 and 53 for:
•Cyst Reduction
•Turbidity Reduction
•Particulate Reduction - Class 1

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Model MWF4100AWS:
The MAYTAG Whole Home Water Filtration System and MAYTAG Whole Home Water Filtration System with Activated Carbon Prefilter
should only be installed where the System and the installation complies with state, provincial and local laws and regulations. The MAYTAG
Whole Home Water Filtration System and MAYTAG Whole Home Water Filtration System with Activated Carbon Prefilter should only be used
to filter water that is cold. The MAYTAG Whole Home Water Filtration System and MAYTAG Whole Home Water Filtration System with
Activated Carbon Prefilter conforms with ANSI/NSF 42/53 for the specific performance claims as verified and substantiated by test data.
The MAYTAG Whole Home Water Filtration System must be installed by a
MAYTAG Services Qualified Service Technician and properly maintained in
accordance with the Owner’s Manual. Failure to properly maintain the System will
compromise performance and/or result in a failure to control water quality.
The MAYTAG Whole Home Water Filtration System is not intended for the treatment
of water that has an obvious contamination source (such as sewage or wastewater).
Biofilm and pathogens in home piping systems could shed into water after it has been
filtered through the MAYTAG Whole Home Water Filtration System. Exposure to
microorganisms may also occur during daily activities.
System Tested and Certified by NSF International against
NSF/ANSI 42 and 53 for:
•Cyst Reduction
•Turbidity Reduction
•Particulate Reduction - Class 1
•Chlorine, Taste and Odour Reduction
Chlorine Reduction Capacity Rating:
396,000/105,000 (litres/gallons)
Do not use the MWF4100AWS, with activated carbon filter
option, with water that is microbiologically unsafe or of
unknown quality unless adequate disinfection before or after the
System. Models with activated carbon filter option certified for
cyst reduction may be used on disinfected waters that may
contain filterable cysts.

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Independent Laboratory Testing Results – Biovir Laboratories
The following information is a summary of the MAYTAG Whole Home Water Filtration System
and MAYTAG Whole Home Water Filtration System with Activated Carbon Prefilter
Independent Laboratory Testing results.
Service
All service and maintenance is to be performed by a MAYTAG Services Qualified Service
Technician.
Should service be required during or after the warranty period, or should you have any questions
regarding how to use your MAYTAG Whole Home Water Filtration System, please call
MAYTAG Customer Care at 1-800-688-2002.
Legal Disclaimer
This manual attempts to outline some of the basic principles of household water collection,
treatment and discharge and some of the features of the MAYTAG Whole Home Water
Filtration System (the “System”). It is not intended to be a definitive dissertation on the
principles set out above and is provided as a reference guide to homeowners. Any other reliance
is expressly excluded herein.
The MAYTAG Whole Home Water Filtration System must be installed by a MAYTAG Services
Qualified Service Technician and properly maintained in accordance with the Operations and the
Owner’s Manual. Failure to properly maintain the System will compromise performance and/or
result in the failure to control water quality.
See tables for Certifications and Laboratory test information.
To reduce the risk of severe injury, illness, death and/or property damage, read and
follow all instructions. Use only MAYTAG authorized parts where required to repair
and service the MAYTAG Whole Home Water Filtration System.
Independently Tested By BioVir Laboratories, Inc. ,
Benicia, California
The MAYTAG Whole Home Water Filtration System has been independently tested by BioVir Laboratories, a California
Department of Health (CDH) Approved Laboratory. The test results were:
Bacteria Reduction* - greater than 99.99999%
Virus Reduction** - greater than 99.7%
* Tested with Echerichia coli bacteria
** Tested with Polio virus

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All MAYTAG Whole Home Water Filtration Products must be installed in accordance
with all local building and plumbing codes.
The MAYTAG Whole Home Water Filtration System must be protected against freezing
and less than 0°C (32 F) temperatures. Failure to do so may cause System to become
damaged, which may lead to personal injury and/or physical damage.
The MAYTAG Whole Home Water Filtration System must be installed on cold-water
distribution systems only. Failure to do so may cause System damage, which may lead to
personal injury and/or physical damage.
The MAYTAG Whole Home Water Filtration System must be filled with water at all
times after installation. Failure to do so may cause System to dry and become damaged,
which may lead to personal injury and/or physical damage.
Trademarks
The following are registered trademarks:
ZENON Environmental Inc.

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System Description
Figure 1. MAYTAG Whole Home Water Filtration System, components and dimensions
Replacement Parts
Table 1 - Replacement parts used with the MAYTAG Whole Home Water Filtration System
Part
Number
Description MWF 4100 AWS MWF 4200 AWS MWF 4300 AWS
67500001 Carbon Prefilter √
67500002 Stainless Steel Prefilter √√
67500008 8” Neoprene cap O – Ring √√√
67500007 System Replacement (includes cap,
O-ring, 3 poly nipples and backpulse
tank)
√√√
67500010 Cap Wrench √√√
67500003 External Prefilter Kit √
67500004 External Prefilter Replacement
Cartridge √
67500025 External Prefilter Wrench √
67500026 External Prefilter O-Ring √
67500005 Base Controller with batteries (2AA) √√
AIR VENT
188cm
(74”)
MINIMUM
CLEARANCE
REQUIRED
163cm
(64”)
119cm
(46.75”)
64cm
(25.25”)
51cm
(20”)
MEMBRANE
MODULE
DRAIN ¾” FNPT
OUTLET ¾”
FNPT
STAND
BACKPULSE TANK
LOCK RING
INLET ¾” FNPT
CAP
AIR BLADDER
VALVE
PREFILTER HOUSING

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67500006 Advanced Controller with batteries
(2AA) √
67500011 Cap √√√
67500012 Lockring √√√
67500013 Backpulse Tank √√√
67500014 Base √√√
67500015 Inlet or Outlet Pipe Assembly √√√(Inlet may also
require solenoid NO)
67500016 Drain Pipe Assembly √√√
67500017 Installation Sub Assembly Kit (inlet,
outlet, drain, air vent) √√√(Inlet may also
require solenoid NO)
67500018 Solenoid Valve NC (Normally Closed) √√√
67500019 Solenoid Valve NO (Normally Open) √
67500020 Hex Elbow, ¾”Mx5/8” Hose Barb √√√
67500021 Air Vent Valve, automatic float, duo
vent √√√
67500009 O-Ring Lube – NSF Certified √√√
67500023 Pressure Test Gauge Assembly √√√
67500024 MAYTAG MC1 Cleaning Solution √(for ground
water only)
Startup of a new MAYTAG Whole Home Water Filtration
System
Once the MAYTAG Services Qualified Service Installer has completed the new System
installation, the owner should thoroughly flush the filtration system before using. Simply open a
nearby water tap and allow to run for about 1 hour. Ensure that the drain is open and unobstructed
and able to accommodate the flow. Do not leave flowing water tap unattended. This will remove
any residual preservative from the new System.
Sanitizing Your Household Distribution System
If your new MAYTAG Whole Home Water Filtration System is being used to filter water from
sources other than a municipal drinking water supply, your household drinking water distribution
system should be sanitized prior to use. Please see your MAYTAG Services Qualified Service
Installer or MAYTAG Customer Care for details.
Maintenance Schedule
All service and maintenance is to be performed by a MAYTAG Services Qualified Service
Technician. An annual integrity test must also be performed by a MAYTAG Services Qualified
Service Technician. This annual test is required as part of the 5 year limited prorated membrane
warranty.
If the MAYTAG Services Qualified Service Technician determines that the System has a high
degree of debris causing a reduction in System flowrate, the number of visits per year may be
increased by MAYTAG to ensure that the System stays within operational limitations set by

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MAYTAG Whole Home Water Filtration System and to ensure the limited warranty protection
remains in effect.
Table 2 outlines the maintenance schedule that should be followed for each Model of the
MAYTAG Whole Home Water Filtration System:
Table 2 – MAYTAG Whole Home Water Filtration System Maintenance Schedule
*MAYTAG Services Qualified Service Technician must conduct an Integrity Test annually in order
to validate the limited warranty.
**BP tank pressure setpoint is recorded on page 2.
Required service Part No. Comments Every 12 Mo.
Carbon Prefilter 67500001
Water sources with high levels
of particulate, usage and/or
chlorine will require more
frequent changes.
Replace
System cleaning -- Clean
Integrity testing* -- Test
Backpulse Tank air
pressure 67500013 Adjust air pressure as
required** Test
Model MWF 4100 AWS
Base Controller
batteries: 2AA -- Check timer and program settings Replace
Stainless Steel
Prefilter 67500002
Water sources having
significant sediment will require
more frequent cleaning.
Clean
System cleaning -- Clean
Integrity testing* -- Test
Backpulse Tank air
pressure 67500013 Adjust air pressure as
required** Test
Model MWF 4200 AWS
Base Controller
batteries: 2AA -- Check timer and program
settings Replace

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Table 2 – MAYTAG Whole Home Water Filtration System Maintenance Schedule(cont.)
*MAYTAG Services Qualified Service Technician must conduct an Integrity Test annually in order
to validate the limited warranty.
**BP tank pressure setpoint is recorded on page 2.
Required service Part No. Comments Every 6 mo. Every 12 Mo.
Stainless Steel
Prefilter 67500002
Water sources with high levels of
particulate will require more frequent
cleaning.
Clean
System cleaning -- Clean
Integrity testing* -- Test
System 67500007
Backpulse Tank
air pressure 67500013 Adjust air pressure as required** Test
External Pre-filter
cartridge 67500004 Highly variable service rate, due to variability in raw water quality.
Clean or
replace
Model MWF 4300 AWS
Advanced
Controller
batteries: 2AA
-- Check timer and program settings Check Replace

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Replacing/Cleaning the Internal Prefilter and Cleaning the
System
All service and maintenance is to be performed by a MAYTAG Services Qualified Service Technician.
These instructions describe the procedure
for installing, replacing or cleaning the
MAYTAG Whole Home Water Filtration
System internal prefilter and cleaning of
the System. Model MWF4100AWS is
equipped with the Carbon Prefilter (Photo
3a) and Models MWF4200AWS and
MWF4300AWS are equipped with the
Stainless Steel Prefilter (Photo 3b).
Important: The System must not be
operated without either an internal
Stainless Steel Prefilter or Carbon
Prefilter in place.
Special tools are required to perform
service. These instructions are provided
for information purposes only. Please call
your MAYTAG Customer Care at 1-800-
688-2002 to arrange all service and
maintenance work.
Photo 3a. Carbon prefilter
(Model MWF4100AWS)
Photo 3b. Stainless steel prefilter
(Models MWF4200AWS and
MWF4300AWS)
Spigot
End
Handle
End

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To reduce the risk of severe injury, illness, death, and/or property damage, read and
follow all instructions. Use only Maytag Whole Home Water Filtration System
authorized parts where required to repair and service the Maytag Whole Home Water
Filtration System.
All service and maintenance is to be performed by a MAYTAG Services Qualified Service
Technician.
Save enough water for cleaning the Stainless Steel Prefilter prior to beginning this procedure.
Your entire house will be without water during this time. Wear clean waterproof gloves while
completing this procedure.
Shut off water 1. Locate the inlet and outlet ball valves. Refer to Photo 1 (page 6).
These should be labeled.
2. Close the inlet and outlet ball valves by turning them clockwise.
Lever handles indicate ‘off’ position when turned perpendicular to
the water pipe as shown in Photo 2b (page 6).
3. If equipped with a bypass valve, keep the bypass valve closed
during this operation. Failure to properly shut off the water may
lead to serious injury and/ or flooding and/or property damage.
Drain the System
for 1 minute 4. Base controller (Models MWF4100AWS and MWF4200AWS) and
Advanced controller (Model
MWF4300AWS): Press the Next button
once until the ‘Manual’ indicator flashes.
Press and hold the Manual Flush button
for 10 seconds. This will open the drain
valve and hold the drain valve open for 5
minutes. You may hear water flowing
down the drain as the valve opens. You
may toggle the valve closed at any time
during the flush by pressing the Manual Flush button once. Press
the Manual Flush button once after 1 minute to close the valve
and avoid draining the System for this step.
Clockwise

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Remove the cap
and internal prefilter
from the System
5. After allowing the System to drain for 1 minute, remove the System cap
using the cap wrench (not supplied, available from MAYTAG). To
remove, turn counter-clockwise as indicated on the top of the cap.
6. Pull the internal prefilter straight up and out of the internal prefilter
housing. The prefilter may be a Carbon Prefilter or a Stainless Steel
Prefilter depending on your model. Place the prefilter in a clean pail or
sink to allow draining. If you have a Carbon Prefilter, dispose in a plastic
bag. If you have a Stainless Steel Prefilter, set it aside until step 9.
7. Wipe out inside of cap and filter chamber with a clean cloth.
8. Inspect System o-ring (located above the System threads for the System
Cap) for any wear or damage. Very small nicks in the o-ring can result in
leaks. If necessary replace o-ring and use a very small amount of NSF
approved lube (available from your MAYTAG Qualified Dealer) to
regrease the o-ring.
During this procedure, DO NOT open the Bypass Valves, as this will allow potentially
contaminated water into the household distribution system. Contaminated water may
lead to personal injury and/or death.
Cleaning the
Stainless Steel
Prefilter
9. If you have a Stainless Steel Prefilter, the outer surface of the Stainless
Steel Prefilter can be cleaned to remove accumulated grit or debris.
Use a brush to loosen solid material and rinse with clean water. It may
be necessary to use water from a point in the system upstream of the
System’s shutoff valve or an alternate water source for rinsing.
Photo 4.
Cap Removal

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Cleaning System
using:
• Chlorine bleach
(surface and
municipal water)
• MAYTAG MC1
Cleaning
Solution
(ground water)
This procedure is to be conducted after the internal prefilter has
been removed from the System. Do not permit the Carbon
Prefilter to come into contact with chlorine bleach or any other
form of chlorine. During this procedure the water level in the
System should be half way up the internal prefilter cavity. If
necessary, add water by slightly opening the inlet ball valve while
observing the water level.
Always wear safety glasses and protective clothing when handling
cleaning chemicals.
10. Add 500mL of household chlorine bleach to System (5.25% as Cl2)
OR 250 mL of 12% chlorine pool bleach OR add the MAYTAG MC1
Cleaning Solution following instructions in the package.
Model Cleaning Chemical Used
MWF4100AWS and
MWF4300AWS, any non-
well water
Chlorine Bleach (5.25% as Cl2)
Chlorine Pool Bleach (12% as
Cl2)
MWF4200AWS, well
water only
MAYTAG MC1 Cleaning
Solution
Never intentionally or unintentionally mix chlorine bleach and MC-1 cleaner as
poisonous and corrosive chlorine gas may be formed.
Chlorine bleach must be less than 3 months old. The active percentage reduces with
time.
After the System has soaked it must be flushed as the sanitizing solution in the water
supply may irritate the skin or cause illness if ingested.
Do not use hot water during maintenance of the System. It is possible that if a hot water
tap is used, high levels of chlorine or MAYTAG MC1 Cleaning Solution will enter the
hot water tank and cause personal injury, illness and/or death.
Soak 60 min.
Re-install Internal
Prefilter.
11. Allow System to soak 60 minutes. Drain System for 5 minutes using the
controller as described in step 4. At the end of 5 minutes the System
Controller Manual indicator will turn off or the System Controller flashing
light will go out.
12. Re-install Stainless Steel Prefilter or install a new Carbon Prefilter and
replace System Cap. When installing a new replacement or a clean,
used internal prefilter, the spigot end of the prefilter (refer to Photo 3a
and 3b on page 15), is carefully fitted into the inlet on the bottom of the
prefilter cavity.

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13. Replace System Cap. Use Cap Wrench to tighten.
Ensure that the cap is properly tightened and that the o-ring is clean and intact otherwise
leaks may occur. Leaks may result in personal injury or property damage.
Fill and Flush for 30
min.
14. Partially open inlet ball valve slowly and watch for leaks. Water will
begin to enter and pressurize the System. The air vent mounted on the
cap is designed to allow air to enter and exit the System. The small
black cap on the air vent should be loose at all times to permit the free
flow of air. Once the System is full of water you will no longer hear air
escaping from the air vent. Fully open the inlet ball valve.
15. Flush to drain using the controller for 5 minutes as described in Step 4.
Open outlet ball valve. Turn on a high demand faucet in your house (ie. a
bathtub tap) and flush the System to a drain for 30 minutes.
16. Wash hands thoroughly after maintenance work.
Replacing the External Sediment Prefilter Cartridge
All service and maintenance is to be performed by a MAYTAG Services Qualified Service
Technician. Some tools/parts are available from MAYTAG. Wear clean waterproof gloves
during this procedure.
When the water is being drawn from a lake or other surface water source,
the MAYTAG Whole Home Water Filtration System is equipped with an
External Sediment Filter. Not all Systems include this device.
Only a MAYTAG Services Qualified Service Technician may service the
External Prefilter. For service, call the phone number at the front of this
manual (page 2).
Failure to clean or replace the External Sediment Prefilter Cartridge may
result in reduced household water pressure.
Photo 5. External Sediment Prefilter

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To reduce the risk of severe injury, illness, death, and/or property damage, read and
follow all instructions. Use only MAYTAG Whole Home Water Filtration System
authorized parts where required to repair and service the MAYTAG Whole Home Water
Filtration System.
Save enough water for cleaning the External Prefilter Housing prior to
beginning this procedure.
Shut off water 1. Close inlet ball valve (refer to Inlet valve as indicated in Photo 1 on
page 6) and/or switch ‘off’ pump upstream of the filter. (The house
will be without water during this operation.)
2. Close outlet ball valve on MAYTAG Whole Home Water Filtration
System. (See Outlet Valve as indicated in Photo 1.)
Relieve pressure
in System for 1
minute
3. Relieve pressure by activating the manual flush function on the
controller of the MAYTAG Whole Home Water Filtration System for
1 minute.
Note: This step must be followed to avoid personal injury and damage
to the System.
Base controller (Models MWF4100AWS and
MWF4200AWS) and Advanced controller
(Model MWF4300AWS)
Press the Next button once until the ‘Manual’
indicator flashes. Press and hold the Manual
Flush button for 10 seconds. This will open the
drain valve and hold the drain valve open for 5
minutes. You may hear water flowing down the
drain as the valve opens. You may toggle the valve closed at any
time during the flush by pressing the Manual Flush button once.
Press the Manual Flush button after 1 minute to close the valve and
avoid draining the System for this step.
Drain filter 4. Drain External Sediment Filter housing by opening
stopcock on the bottom. Water may be drained directly
into a container or through a ¼” plastic hose attached
to the stopcock. Press and hold the red button on the
top of the housing to allow air to enter the housing and
drain more quickly.
Stopcock