GMCW Brew-10H Guide

Warning Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . .4 - 5
Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Water Hook-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Electrical Hook-up & Start-up Procedure . . . . . . . . .7
Operating the Touchpad . . . . . . . . . . . . . . . . . . . . .7
Brewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
RFID Grind Select Brewing . . . . . . . . . . . . . . . . . . .8
RFID Antenna & Tag Location . . . . . . . . . . . . .8 & 9
Bean Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
User Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Pulse Brew Cycle . . . . . . . . . . . . . . . . . . . . . . . . .10
User Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Brew Volume Setting . . . . . . . . . . . . . . . . . . . . . . .12
System Restore Feature . . . . . . . . . . . . . . . . . . . .12
User Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Factory/Field Test Menu . . . . . . . . . . . . . . . . . . . .13
Water System Errors . . . . . . . . . . . . . . . . . . . . . . .14
Timer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Setting the Grind . . . . . . . . . . . . . . . . . . . . . . . . . .14
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Shear Plate Replacement . . . . . . . . . . . . . . . . . . .16
Air Shutter Operation . . . . . . . . . . . . . . . . . . . . . . .16
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . .17
Exploded Views . . . . . . . . . . . . . . . . . . . . . . .19 - 26
Wiring Harnesses . . . . . . . . . . . . . . . . . . . . . . . . .27
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . .28 GMCW
4003 Collins Lane
Louisville, KY 40245 USA
[phone]
[phone]
FAX [phone]
www.gmcw.com
© GMCW, 1997
PRINTED IN USA
Patents Pending
0713 Form # BW-354-02
Part #72074
Grind’n Brew Coffee Systems®
Operation and Instruction Manual
for
Models: -10H, -11H, -20H, -21H versions
TABLE OF CONTENTS
Model Grind’n Brew-10H
Model Grind’n Brew-20H Model Grind’n Brew-21H
Model Grind’n Brew-11H

Grind’n Brew®Coffee Systems Page 3
Warning Labels
Part #71949
Located on the brew basket
Part # 70248
Located on Splash Panel

Page 4 Grind’n Brew® Coffee Systems
Technical Data - Single Bean Models
Voltage 120 120
Frequency 60Hz 60Hz
Watts 1710 1810
Circuit Breaker 15 15
No. of Hoppers 1 1
Hopper Capacity/Hopper 5.5 lbs 5.5 lbs
Brew Capacity .5 gal. .5 gal.
No. of Warmers 0 1
10H
(72078)
11H
(72079)
Grind n Brew X X
Grind Only X X
Brew Only X X
Half Brew X X
Printed Casing
Stainless Casing X X
Features
U.L. Electrical X X
CUL Electrical X X
U.L. Sanitation X X
Agency Approvals
Dimensions (H x W x D) 31” x 9.25” x 24.25”
(79 cm x 23 cm x 62 cm)
26.25” x 9.25” x 24.25”
(67 cm x 23 cm x 62 cm)
Weight 65 lbs. 65 lbs.
Shipping Weight 80 lbs. 80 lbs.

Grind’n Brew®Coffee Systems Page 5
Technical Data - Dual Bean Models
Voltage 120 120
Frequency 60Hz 60Hz
Watts 1710 1810
Circuit Breaker 15 15
No. of Hoppers 2 2
Hopper Capacity/Hopper 6.5 lbs 6.5 lbs
Brew Capacity .5 gal. .5 gal.
No. of Warmers 0 1
20H
(72050/72076)
21H
(72077)
Grind n Brew X X
Grind Only X X
Brew Only X X
Half Brew X X
Printed Casing
Stainless Casing X X
Features
U.L. Electrical X X
CUL Electrical X X
U.L. Sanitation X X
Agency Approvals
Dimensions (H x W x D) 37.5” x 9.5” x 24.25”
(95 cm x 23 cm x 62 cm)
32.75” x 9.5” x 24.25”
(83 cm x 23 cm x 62 cm)
Weight 80 lbs. 80 lbs.
Shipping Weight 95 lbs. 95 lbs.

PPage 6 Grind’n Brew®Coffee Systems
Unit Installation
IMPORTANT:This brewer should be installed by a knowledgeable and experienced commercial
equipment installer.
Brewer Contents
Your brewer package should include the following:
1 Grinderbrewer (either single or dual bean)
1 Operation and Instruction Manual (this manual)
1 Hose to 1/4" flare fitting (part # 61237)
Tools Required for Installation
#2 Phillips screwdriver
9/16" wrench
5/8" wrench
(or crescent wrench)
6" level
NOTE: Other tools may be needed depending on the type of water supply tubing and location.
1. Inspect unit to see if any damage occurred in shipment.
2. Position brewer on counter. Place on sturdy permanent counter top. If you have an airpot brewer, install the 4"
plastic legs (included) at the bottom of the brewer. Lean the brewer towards its side to expose screwholes under-
neath for legs. Adjust the leg height to suit the size of airpots you will use. IMPORTANT: Adjust the feet to
level the brewer. With bubble level, check to see that the brewer is level on countertop.
Water Hook-up (All Models) (Refer to Figure A)
IMPORTANT: This equipment must be installed in compliance with applicable Federal, State and/or
Local plumbing codes having jurisdiction. Incoming water pressure should be greater
than 20 psi and not more than 100 psi.
1. The incoming water supply should have a shut-off valve connected in-line. The end should have a female 1/4"
flare fitting. Water supply should be a 1/4" I.D. dedicated line branched off a 1" or larger supply line.
2. Prior to installing the brewer, flush out the water line by running approximately 1 gal. of water into a pail.
This will insure no sediment from a new installation can get in the brewer.
3. Make sure your source water is turned off. Connect the water line’s 1/4" female flare fitting (1) to the 1/4" male fit-
ting on the hose connector (2).
4. Make sure Grind’n Brew is unplugged. Connect the water line to the brewer with the hose connector (2).
5. Turn the water valve on, sending water to the brewer. If there are any leaks, tighten connections to stop leakage.
Figure A

Grind’n Brew®Coffee Systems Page 7
Electrical Hook-up and Start-up Procedure (All Models)
IMPORTANT: Do not plug the unit in yet.
IMPORTANT: This equipment must be installed in compliance with applicable Federal, State and/or
Local electrical codes having jurisdiction. Do not use extension cords. Make sure that
the outlet the brewer plugs into is grounded.
IMPORTANT: Make sure that the Main Power Switch in the back of the unit is in the Off position before
plugging in the brewer.
1. Plug the brewer into an electrical outlet.
2. Make sure the brew basket is inserted in the brew rails.
3. Reach to the back of the brewer and press the white Main Power Switch to the On position. The front control lights
will go on, and water will enter the brewer. The tank will fill in 2-3 minutes from the moment the Main Power Switch is
turned on.
4. Once the tank is full, it will take 10-15 minutes to heat the water to the brewing temperature. Once the Ready light is
lit, you are ready to brew.
IMPORTANT: Brewers are factory set for throw weight and water portion. Please check that installation
is correct before making adjustment. No adjustments should be necessary for normal
installation.
Operating the Touchpad (Refer to Figure B)
1. To select the appropriate bean hopper, press the hopper (left) button until the desired indicator arrow is illuminated.
NOTE: This step only applies to dual bean hoppers. Does not apply to RFID grind select option dual bean
hoppers.
2. To select a portion size, press the center of the Portion Size (middle) button until the half pot or full pot symbol
(depending on your need) is illuminated.
3. The Mode (right) button allows you to select either the “Brew Only”, “Grind Only” or “Grind and Brew” feature.
a) To grind only, press the center of the Mode (right) button until the grinder symbol is illuminated.
b) To brew only, press the center of the Mode (right) button until the coffee cup symbol is illuminated.
c) To grind and brew, press the Mode (right) button until both symbols are illuminated together.
(Single Bean Model) Figure B
(Dual Bean Model)
Half or Full Pot
Bean Selector
(Dual Bean Models Only)
Grind only
Brew only
Grind and Brew Option

Page 8 Grind’n Brew®Coffee Systems
Brewing
IMPORTANT: Brewers are factory set for the correct grind and brew times for average situations. You
should not need to make adjustments in the field.
1. Make sure that a new paper filter is in the brew basket and the brew basket is in place in the brewer.
2. Place beans in the hopper.
3. Choose to “Grind and Brew”. Press the far right touchpad so “Grind and Brew” lights are lit.
4. Choose the Portion Size. Press the middle touchpad until desired volume is lit.
5. Choose Decaf or Regular coffee (only applicable to dual bean Grind’n Brews without RFID Sensor). Press left
touchpad.
Arrow will either point left or right for Decaf or Regular.
6. Place a decanter or airpot under the brew basket, depending on the model.
7. Press Start. You will see the coffee bean level go down slightly. You will hear the coffee grind. Coffee is automati-
cally ground, portioned and placed in brew basket. Then ground coffee is automatically brewed. The Ready light
will now blink, indicating that grinding and brewing are in progress. This will take 3-4 minutes for a 1/2 gal. pot.
Portions are factory set. A stop function is added to the start switch. When this switch is depressed, it allows the
unit to stop during the selected grind, brew or grind and brew functions.
After brewing a pot, the tank must reheat. Reheat time is 5 1/2 - 8 minutes for 120V brewers. Remember that the
brewer will not function (although the grinder will) until the Ready light is on, indicating that the water is hot
enough to brew. A flashing green light indicates that the brewer is reheating or that there is a cycle in progress.
Do not remove the brew basket while the light is flashing. The brew basket must be removed before a new
brew can be initiated. This feature ensures that the operator discards the old coffee grounds and installs a new
coffee filter.
1. Make sure that a new paper filter is in the brew basket and the brew basket is in place in the brewer.
2. Place beans in the hopper.
3. Choose to “Grind and Brew”. Press the far right touchpad so “Grind and Brew” lights are lit.
4. Choose the Portion Size. Press the middle touchpad until desired volume is lit.
5. Place an airpot with the RFID tag under the brew basket aligning the tag with the sensor.
6. If a valid tag is read, a light under one of the hoppers will flash indicating which hopper will be used for grinding
and brewing. If satisfied with the choice press Start and the brewing cycle will begin. You will see the coffee
bean level go down slightly. You will hear the coffee grind. Coffee is automatically ground, portioned and placed in
brew basket. Then ground coffee is automatically brewed. The Ready light will now blink, indicating that grinding
and brewing are in progress. This will take 3-4 minutes for a 1/2 gal. pot. Portions are factory set. A stop function
is added to the start switch. When this switch is depressed, it allows the unit to stop during the
selected grind, brew or grind and brew functions.
After brewing a pot, the tank must reheat. Reheat time is 5 1/2 - 8 minutes for 120V brewers. Remember that the
brewer will not function (although the grinder will) until the Ready light is on, indicating that the water is hot
enough to brew. A flashing green light indicates that the brewer is reheating or that there is a cycle in progress.
Do not remove the brew basket while the light is flashing. The brew basket must be removed before a new brew
can be initiated. This feature ensures that the operator discards the old coffee grounds and installs a new coffee
filter.
RFID Grind Select Brewing Option
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Grind’n Brew®Coffee Systems Page 9
Bean Counter
The built-in bean counter measures relative usage of its Grind’n Brew® machine by totaling the amount of seconds
the augers have fed beans into the grinder. This number directly correlates to the amount of beans used by the
machine.
Depending on model, the bean counter is either always shown or hidden to the user.
The Bean Counter Menu is accessed by holding the UP and DOWN keys for 5 seconds. If the counter is normally
hidden, it will be shown here. The user can reset the counter through this menu. Pressing the SET button will
display “REs” and the user can select “YEs” or “no” with the UP and DOWN keys. Pressing the SET key finalizes
the selection. This menu times out after 10 seconds and is disabled by the User Lockout Jumper.
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Page 10 Grind’n Brew®Coffee Systems
User Menu
The User Menu is accessed by pressing the SET key on the display board. Navigation is accomplished by pressing
the UP, DOWN and SET keys. Feedback to the user is shown by the 3-digit numerical display.
The User Menu exits after a 1 minute timeout or all modes are stepped through. This menu is disabled by the User
Lockout Jumper.
Brew Settings - Brew Cycle Selection
There are four independent settings for brew cycles: Regular Full Brew, Regular Half Brew, Decaf Full Brew and
Decaf Half Brew. The User Menu adjusts settings for the brew cycle selected by the keypad. For instance, if
you want to change settings for Decaf Half brew then set the keypad to the Decaf Hopper and Half Brew Size
before entering the User Menu. The keypad settings cannot be changed while the User Menu is displayed.
User Menu Navigation
Advancing through the menu is done by pressing the SET Key. Each parameter is adjusted by pressing the UP
and DOWN keys. Pressing and holding the UP and DOWN keys will quickly scroll through settings. The table on
the next page shows how to step through this menu.
User Settings
The Grind’n Brew® has several factory-set options that can be modified by the user. These are divided into two
categories: Universal Settings or Brew Settings. Universal Settings pertain to the whole unit, and Brew Settings
pertain to one of the four available brew cycles – (Regular Full, Regular Half, Decaf Full and Decaf Half). All
settings are retained during a power loss. The original factory settings can be restored by using the System
Restore Function.
Universal Settings Brew Settings x 4
Temperature Scale Auger Time
Water Temperature Pulse Brew Pulses
Low Temp No Brew Enable Pulse Brew Pour Time
Pulse Brew Delay Time
Brew Time
User Settings
Pre-Infusion and Pulse Brew Cycle
Pulse Brewing is a feature that increases the control and performance of the Grind’n Brew® machine. By pulsing
water during the brew cycle, you allow greater contact time and better extraction of the coffee. Ultimately you will
achieve a bolder and more consistent cup of coffee by using this feature.
If pulse brewing is selected, the unit will brew the number of pulses identified by the Pulse Brew Pulses setting.
Each pulse is identical. It will begin by dumping water for the Pulse Brew Pour Time and then wait for the Pulse
Brew Delay Time. This will repeat until all pulses are finished.
Once the pulses are complete, the unit will pour water for the remaining Brew Time. Brew Time is the total amount
of time water is poured over the coffee grinds. Pulse Brew Pour Times are included in this total. Pulse Brew
Delay Times are not included. The cycle will always stop pouring once the Brew Time is met, regardless of
whether this happens in the middle of pulse brewing.
Drip Time is half of the Brew Time. However, the Drip Time will never be greater than 1:30.
Pre-Infusion Controls - The first on cycle and the first off cycle. Independent of pulses.

Grind’n Brew®Coffee Systems Page 11
Step Setting Display Adjustments
1Temperature Scale between °F or °C
Displays the current
selection. Factory default
is “°F”
“°F” or “°C”
2Water Temperature
setpoint in °F or °C
Displays the current
selection. Factory default is “195” in °F or “91”
in °C.
“170” to “205” °F
“77” to “96” °C
3
Show Auger Time
the amount of coffee beans fed into
the grinder
“At” None
4
Set Auger Time
the amount of coffee beans fed into
the grinder
Displays the current
selection depending on Brew Cycle “0.1” to “45.0” seconds
5
Show Brew Time
Total amount of pour time for the
brew cycle
“br” None
6
Set Brew Time
Total amount of pour time for the
brew cycle
Displays the current
selection depending on Brew Cycle
“0.01” to “6.00” in
minutes.seconds
7Show Pre-Infusion on “Pre-Infusion on” None
8Set Pre-Infusion on time Displays the current selection of on time “Off” to “2.00” minutes
9Show Pre-Infusion off “Pre-Infusion off”
10 Set Pre-Infiusion off time Displays the current selection of off time “5 seconds” to “1 minute”
11 Show Pulse Brew “P-b” None
12
Pulse Brew Pulse Number
sets the number of pulses in the brew
cycle
Displays the current
selection depending on Brew Cycle “OFF” to “10”
13
Pulse Brew Pour Time
sets the amount of pour time in each
pulse
Displays the current
selection depending on Brew Cycle
“0.05” to “1.00” in
minutes.seconds
14
Pulse Brew Delay Time
sets the amount of delay time
between each pulse
Displays the current
selection depending on Brew Cycle
“0.05” to “1.00” in
minutes.seconds
15 Show Low Temp No Brew “Ltn” None
16 Set Low Temp No Brew
enable or disable
Displays the current
selection. Factory default
is “YES”
“OFF” or “ON”
User Menu Chart
(Dual Bean Model)
Half or Full PotBean Selector
(Dual Bean Models Only)
Grind only
Brew only
Grind and Brew Option
The three settings selected on the touchpad directly
corresponds to what is being adjusted on the display.

Page 12 Grind’n Brew®Coffee Systems
Brew Volume Setting Menu
This feature sets the brew time based on water volume of a desired container. Before using this feature, remove the
brew basket, remove the spray head and place the desired container in place underneath the brewer.
The Brew Volume Setting Menu is started by selecting a brew cycle and holding in the START switch for 5
seconds. The display will show “Pro” at this time. Again press the START switch, and water will begin dispensing
into the container. The display shows a Brew Time count at this time. When satisfied with the water level, again
press the START switch. At this point the Brew Time flashes on the display for 20 seconds. Press the START
switch again within the 20 seconds to accept the new Brew Time. No changes will be made if the Brew Time is not
confirmed in this last step.
There are four independent brew times in the unit. The set Brew Time is the cycle shown on the keypad. The
keypad cannot be modified while setting the brew volume. This feature is disabled by the User Lockout Jumper.
System Restore Feature
This function will restore a Grind’n Brew® unit to its original factory settings. To activate system restore, power on
the unit while holding in the DOWN button.
Continue holding the DOWN button and the display will scroll “rEStorE” to indicate that a system restore is about to
happen. If the DOWN button is released at this point, the restore is cancelled. If the button hold is continued, the
display will scroll “donE” to show completion of a system restore.
Upon a successful restore, the original factory settings will override all changes. The bean counter is not affected.
User Lockout
User Lockout is achieved via the position of the LOCK jumper on the board header. Locate the header on the board
(shown below) and place the jumper in the desired position. In the Locked position all menus in this document are
locked out, and the unit will only allow brewing or grinding functions. There are two versions of the header, 10 pin
and 2 pin. Both configurations are shown below.
User Lockout Jumper
User
Lockout
Jumper
Locked
Unlocked
LOCK
LOCK
2 Pin Version
1 LOCK
1 LOCK
Locked
Unlocked
10 Pin Version

Grind’n Brew®Coffee Systems Page 13
Factory/Field Test Menu
This menu is intended to check product functionality both at the end of the factory line and in the field. This mode is
entered by pressing and holding the DOWN key on the display board and Full/Half key on the keypad for
10 seconds. Once the menu is entered, the unit will start with an LED test that lights all LEDs and segments on the
display. Navigation is done just like the User Menu. Refer to the table below for operation. Field Test Mode exits
after stepping through all modes only – there is not a timeout.
Step Function Operation Description
1LED Test All LEDs ON Verify that all LEDs turn on.
2Firmware Version Display firmware version Shows the software version of the control.
3Date Code Display date code/serial ID Not used with Grind’n Brew®
4Non Resetable Bean
Counter
Scroll non-resetable bean counter Shows the total number of seconds the
grinder has been grinding (non-resetable)
5Configuration Inputs Each digit of the display corresponds to a
configuration input. The input is either
“0” - disabled or “1” - enabled.
Highest Digit (left most):
“1” - Double Hopper;
“0” - Single Hopper
Middle Digit (center):
“1” - Always show bean count;
“0” - Don’t show bean count
Lowest Digit (right most):
“1” - Grind’n Brew® Model;
“0” - Grind Only Model
6Display Water
Temperature
Show averaged A/D reading of temperature Show the current temperature in °F of the
thermistor
7Display Water Level 1 Show averaged A/D reading of water level 1 If > 500 water level full,
If < 500 water level not full
8Display Water Level 2 Show averaged A/D reading of water level 2 Not used with Grind’n Brew®
9Show Input Display scrolls “InPut”Input Test Mode
10 Input Test Press each key and the display will show a
number related to that key
Hopper Button: 12
Size Button: 10
Grind/Brew Button: 8
Down Button: 0
Up Button: 2
Start Switch: 16
Basket Out Switch: 17
Select Button: advances Factory Test to
Step 11
11 Show Output Display scrolls “outPut”Output Test Mode
12 Output Test Turns on each relay separately. Displays
“O##“ where:
## = 2 digit output number
IMPORTANT: Each output will be turned
ON when its number is on the display
REGARDLESS of temperature or fill
level. Be CAREFUL not to overfill the
tank and keep electric items out of the
way of the brew channel.
Scroll through relay outputs with the UP
and DOWN keys. Outputs are as follows:
O01: Fill Valve
O02: Brew Valve
O03: N/A
O04: Left Auger Motor
O05: Right Auger Motor
O06: not used
O07: Heater
O08: Grinder Motor
O09: Basket Out Light
O10: Ready Light

Page 14 Grind’n Brew®Coffee Systems
Figure C
Timer Settings
A standard 64 oz. bottle Grind’n Brew All Airpot Grind’n Brews
• Increase of 1 sec. to timer setting equates to an increase in fluid volume by 1/2 oz.
• Decrease of 1 sec. to timer setting equates to a decrease in fluid volume by 1/2 oz.
Setting Approx. Setting Approx.
Single Bean yield Dual Bean yield
Single/Left Full Pot 4.2 sec. 2 oz. 5.7 sec. 2 oz.
Right Full Pot - - 5.7 sec. 2 oz.
Single/Left Half Pot 2.4 sec. 1.25 oz. 3.0 sec. 1.25 oz.
Right Full Pot - - 3.0 sec. 1.25 oz.
Full Pot 112-125 sec. 62 fl oz. 112-125 sec. 62 fl oz.
Half Pot 56-63 sec. 31 fl oz. 56-63 sec. 31 fl oz.
Setting Approx. Setting Approx.
Single Bean yield Dual Bean yield
Single/Left Full Pot 4.5 sec. 2.3 oz. 6.2 sec. 2.3 oz.
Right Full Pot - - 6.2 sec. 2.3 oz.
Single/Left Half Pot 2.7 sec. 1.4 oz. 3.7 sec. 1.4 oz.
Right Full Pot - - 3.7 sec. 1.4 oz.
Full Pot 140-153 sec. 72 fl oz. 140-153 sec. 72 fl oz.
Half Pot 70-77 sec. 36 fl oz. 70-77 sec. 36 fl oz.
Water System Errors
There are four system errors that can be detected by the microprocessor. These errors are:
1. Water Fill Error (Er1) – the water full detection has failed, and the fill valve has been on for at least 5 minutes.
2. Thermistor Error (Er2 or Er3) – the Thermistor is detected either open, shorted OR the water is boiling.
3.Heater Error (Er4) – the heater has been on for 3 minutes, but no rise in water temperature was detected.
If any of these errors are detected, the unit will shut off all water fill and heat related functions. Brewing is disabled,
but grinding is still allowed. The display will show the error when the unit is idle. To clear any error, the user can
hold in the UP key for 5 seconds, reset power to the unit or enter field test mode.
Setting the Grind (Refer to Figure C)
Tools Required: #2 Phillips screwdriver, 7/8" box wrench, large flat blade screwdriver
1. Remove front decal panel by removing screw on underside of
panel and 2 screws on both sides of panel.
2. Loosen adjusting screw lock nut by turning counter clockwise.
3. Turn slotted adjusting screw clockwise to make the grind coarser
or counter clockwise to make the grind finer.
Generally, a 1/8 to 1/4 turn will provide the desired adjustment.
4. After adjustment has been made, re-tighten the adjusting
screw lock nut.
5. Visually inspect the grind adjustment with a small portion of coffee and
readjust if necessary.
6. Reinstall the front decal panel.

Maintenance
Daily Cleaning
Cabinet: The outside of the machine can be cleaned with a damp cloth, a household dusting
spray or a stainless steel cleaner. Do not use any abrasive such as Scotchbrite or
Brillo pads. These may mar the finish.
Wipe the underside of the cabinet hood with a clean cloth. Be especially careful
when using soap or detergent around the sprayhead. Any soap left on the deflector
may give an unpleasant taste to the first brews.
Warmers: The warmer plate is easy to clean and will maintain its appearance longer if cleaned
regularly. Coffee stains can be wiped off with a damp cloth. Use detergent or
sanitizer for heavy deposits, but refrain from using abrasives.
Weekly Cleaning
Coffee Grounds Outlet: Using a clean, dry cloth, wipe
area around spray deflector and coffee grounds outlet.
Using a clean, dry stubby brush, clean up inside of the
coffee grounds outlet.
Brew Basket, Airpots and Decanters: Use com-
mercial grade urn cleaner (as directed by manufac-
turer) and rinse thoroughly.
Grind’n Brew®Coffee Systems Page 15
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Step Setting Display
1Fill Valve Time “FIL”
2Display Time Time displayed in minutes
3Brew Valve Time “Br”
4Display Time Time displayed in minutes
5Shutter Solenoid Time “SHt”
6Display Time Time displayed in minutes
7Shutter Solenoid Cycles “SHC”
8Display Time Time displayed in minutes
9Left Auger Time “A-L”
10 Display Time Time displayed in minutes
11 Right Auger Time “A-R”
12 Display Time Time displayed in minutes
13 Heater Time “Htr”
14 Display Time Time displayed in minutes
15 Grinder Time “Grn”
16 Display Time Time displayed in minutes
Component Counter Display
To enter counter displays press and hold
the middle and right buttons of the user
interface 71958.
To move to next setting press and release
left button on user interface 71958.
To reset the coun, press and release the
down button on the programming interface
71957.

Page 16 Grind’n Brew®Coffee Systems
Shear Plate Replacement (Refer to Figure E)
Tools Required: #2 Phillips screwdriver, large flat blade screwdriver
1. Unplug the machine.
2. Remove the front panel. Shut off the bean flow to the grinder. Single bean units require you to pull the
bean shut-off valve forward. Dual bean units require you to push the bean shut-off valve back into the
slots in the hopper.
3. Remove the hopper cradle. Remove the two screws in the front,
lift the front of the cradle and slide cradle back about an inch to
disengage the hopper clips. Then lift the hopper cradle assembly
off of the machine.
4. Remove the spray head. First remove the spray deflector by
spinning it clockwise. Second, pull the spray nozzle away
from the mounting sheet.
5. Remove the grind cap by loosening the 2 screws and rotating
the grind cap away from the screws.
6. Pull out the revolving burr and feedworm assembly. The
sweeps on the revolving burr and feedworm assembly. The
sweeps on the revolving burr must line up with the cut outs
on the grind head.
7. Remove the shear cap and broken shear plate.
8. Slide the rotating burr onto the motor shaft, aligning up the
sweeps with the cutouts on the grind head. Rotate the burr
so that the burr is held back into the burr pocket by the sweeps on the grind head lip. Slide the
drive coupler into place. Rotate the slot on the drive coupler with the feedworm. Insert a new
shear plate.
9. Reassemble the remaining components in reverse order of disassembly.
Figure E
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Air Shutter Operation
Gentle Airflow
The air shutter feature on the Grind’n Brew® prevents moisture from entering the grinding chamber and
delivery chute. A gentle airflow exiting the grinding port as shown indicates proper function of the air
shutter. Lightly moistening your hand before checking the airflow will help in the detection of the gentle
airflow.

Grind’n Brew®Coffee Systems Page 17
 CAUTION: Unplug power cord from outlet before cleaning or servicing the unit.
Troubleshooting Guide
The following procedures must be performed by a qualified service technician.
Problem Possible Cause Remedy
Weak coffee • Not enough coffee used.
• Grind is too coarse.
• Water not hot enough.
• Too much water used (half brews).
• Coffee bed has dry areas.
• Set to portion more coffee.
• Readjust grind to a finer grind.
• Check spray temp, should be
greater than 185°F.
• Adjust brew time at the controller.
• Spray deflector broken or missing.
Replace.
Strong coffee • Too much coffee used. • Readjust coffee portion.
Bitter coffee • Grind is too fine. • Coarsen grind setting.
Grounds in coffee • Paper filter collapsed during
brewing.
• Use proper filter.
Brew basket overflowed • Too much coffee.
• Coffee ground too finely.
• Double batching.
• Use no more than 3 1/2 oz. of coffee.
• Coarsen grind.
• You must dump old coffee and use
fresh new filter for each brew.
Unpleasant taste • Water tank or brew basket needs
cleaning.
• Clean, sanitize (de-lime).
• Refer to Regular Maintenance
section.
Brewer will not brew • Basket has not been changed. • Remove basket, replace filter,
reinstall.
Grinder will not start when start
button is pushed
• Main power switch turned off.
• No power to outlet.
• Basket out.
• Circuit breaker has tripped.
• Basket has not been changed.
• RFID antenna not sensing RFID
tag on Airpot (RFID grind select
only).
• Turn main power switch, on located
on back of unit (left side from front) on.
• Check outlet with lamp or radio to
verify outlet has power.
• Ensure basket is in position.
• Reset circuit breaker (located on
back of unit) by pushing the reset
button in until you hear a click.
• Remove basket, replace filter,
reinstall.
• Rotate Airpot to align RFID tag to RFID
antenna.
Grinder runs or hums but no
coffee is dispensed
• Shear disc is broken.
• Obstruction in opening of auger
assembly (on dual bean units).
• Obstruction in opening to grinding
chamber.
• Blown fuse on controller board
(Dual bean only).
• Replace shear disc. See Shear
Disc Replacement section.
• Remove hopper and clear
obstruction.
• Remove hopper and clean
obstruction.
• Check for blown fuse and replace
with 5 Amp fuse.
Grinder chute clogs • Air shutter fan is not operational.
• Air shutter fan is installed backwards;
Air flow must be directed out of the
grinder chute to prevent moisture
from entering grinder chute.
• Confirm that fan is operational by
observation after removal of the right
side panel access plate.
• Ensure fan is installed with arrow pointing
toward the grind head to allow air to be
directed into the brew funnel.
Quantity of coffee dispensed
each throw is not the same
• Defective timer in controller. • Check the length of time grinder
runs with watch.
• Remove upper assembly and clean
obstruction.

Page 18 Grind’n Brew®Coffee Systems
Troubleshooting Guide (cont.)
If you still need help, call our Technical Service Department at 800-695-4500 (USA & Canada only) or 502-425-4776,
Monday through Friday, 8:00 AM - 8:00 PM Eastern Standard Time or an authorized service center in your area. Please
have the model and serial number ready so that accurate information can be given.
Prior authorization must be obtained from Grindmaster Corporation’s Technical Services Department for all warranty
claims.
Problem Possible Cause Remedy
Circuit breaker continuously
trips
• Insufficient current due to use of
extension cord.
• Insufficient current due to
overloaded line.
• Plug unit directly into outlet. Do not use
extension cord.
• Designate single line for unit. Do not
use multi outlet box.
Basket Out light flashing
(Display board displays “ER1”)
• Water fill valve on too long.
• Water supply turned off.
• Clean or replace water fill valve.
• Turn water supply on.
Basket Out light flashing
(Display board displays “ER2 or
ER 3”)
• Problem with Thermistor. • Replace if defective.
Basket Out light flashing
(Display board displays “ER4”)
• Heater Relay failed.
• Contactor Failed.
• Heater Failed open.
• Hi Temp failed.
• Control Board output failed.
• Replace defective component.
Water not hot enough • Thermistor not set high enough.
• Defective thermistor.
• Reprogram thermistor / temp settings.
• Replace Thermistor.
Water boiling (or steaming) • Thermistor set too high.
• Defective Thermistor.
• Reprogram thermistor / temp settings.
• Replace Thermistor.
Start switch not working
(Basket Out light illuminated)
• Brew basket out of place. • Replace basket.
No lights are on
(Including Warmer light)
• No power to brewer.
• Power switch turned Off.
• Turn power on.
• Turn switch on.
No touch pad lights
(other lights o.k.)
• Touch pad disconnected. • Reconnect touch pad.
Too much or not enough water
in decanter
• Water time adjustment. • Readjust.
Spray head dripping • Lime build up in dump valve. • Delime unit.
Hot water spigot dripping • Faulty seal. • Replace seal.
Hot water spigot not dispens-
ing
• Drain tube limed-up.
• Defective valve seat.
• Delime tank and drain tube.
• Replace seat.
Warmer Failure • Loss of power.
• Defective warmer switch or
warmer heater.
• Check power source.
• Perform continuity test. Replace defec-
tive component.
Auger motor, water solenoid
not working
• Bus fuse on controller board is
blown.
• Replace 5 Amp bus fuse.
Basket Out or Brew Cycle
indicators will not light up
• Polarity reversed.
• LED burned out.
• Connect red wire to red terminal of
LED.
• Replace LED.

Grind’n Brew®Coffee Systems Page 19
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Exploded View Grind ‘n Brew Assembly

Page 20 Grind’n Brew®Coffee Systems
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