Grindmaster GRINDN BREW 20H User Manual

Grind’n Brew Coffee Systems®  
Operation and Instruction Manual  
for  
Models: -11, -21, -10, -20 including H, HQ versions  
TABLE OF CONTENTS  
Warning Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . .3  
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Unit Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Water Hook-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
Electrical Hook-up & Start-up Procedure . . . . . . . . .6  
Operating the Touchpad . . . . . . . . . . . . . . . . . . . . .6  
Brewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
User Lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7  
Model Grind’n Brew-10H  
Model Grind’n Brew-11H  
Bean Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
User Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Pulse Brew Cycle . . . . . . . . . . . . . . . . . . . . . . . . . .8  
User Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
Brew Volume Setting . . . . . . . . . . . . . . . . . . . . . . .10  
System Restore Feature . . . . . . . . . . . . . . . . . . . .10  
Factory/Field Test Menu . . . . . . . . . . . . . . . . . . . .11  
Water System Errors . . . . . . . . . . . . . . . . . . . . . . .12  
Timer Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . .12  
Setting the Grind . . . . . . . . . . . . . . . . . . . . . . . . . .12  
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13  
Shear Plate Replacement . . . . . . . . . . . . . . . . . . .14  
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . .15  
Exploded Views . . . . . . . . . . . . . . . . . . . . . . . . . . .17  
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . .22  
Model Grind’n Brew-20H  
Model Grind’n Brew-21H  
Prior authorization must be obtained from  
Grindmaster Corporation for all warranty claims.  
Grindmaster Corporation  
4003 Collins Lane  
Louisville, KY 40245 USA  
(502) 425-4776  
(800) 695-4500  
(800) 568-5715 (Technical Service Only)  
FAX (502) 425-4664  
© Grindmaster Corporation, 1997  
PRINTED IN USA  
Patents Pending  
1008 Form # BW-350-14  
Part #70661  
Warning Labels  
! WARNING:  
USE ONLY ON A CIRCUIT THAT IS PROPERLY PROTECTED AND CAPABLE OF THE  
RATED LOAD.  
! WARNING:  
ELECTRONICALLY GROUND THE CHASSIS.  
! WARNING:  
DO NOT DEFORM PLUG OR CORD.  
! WARNING:  
FOLLOW NATIONAL AND LOCAL ELECTRICAL CODES.  
! WARNING:  
WATER CONNECTIONS SHALL COMPLY WITH THE PLUMBING CODE OF BOCA & THE  
FOOD SERVICE SANITATION MANUAL OF THE FDA  
! WARNING:  
DO NOT USE NEAR COMBUSTIBLES.  
! WARNING:  
FAILURE TO COMPLY RISKS PERSONAL INJURY, DAMAGE TO EQUIPMENT, FIRE OR  
SHOCK HAZARD.  
! WARNING:  
READ THE ENTIRE OPERATING MANUAL INCLUDING THE LIMIT OF WARRANTY AND  
LIABILITY BEFORE BUYING OR USING THIS PRODUCT.  
! WARNING:  
ALWAYS UNPLUG UNIT FROM POWER SUPPLY BEFORE SERVICING.  
Grind’n Brew® Coffee Systems  
Page 3  
Technical Data - Single Bean Domestic Models  
120  
120  
208/240  
2674  
208/240  
3560  
120  
120  
208/240  
2749  
208/240  
3660  
1710  
1710  
1810  
1810  
x
x
x
x
x
x
x
x
Technical Data - Dual Bean Domestic Models  
120  
120  
208/240  
2674  
208/240  
3560  
120  
120  
208/240  
208/240  
1810  
1810  
1810  
2749  
3660  
3660  
1710  
1710  
Page 4  
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 5  
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.  
IMPORTANT: Domestic Q models at 208/230V must have a 4 wire electrical connection. The circuit must  
have 2 hots, 1 ground and 1 neutral wire. Failure to install with a 4 wire connection will void  
the manufacturer’s warranty. 208/230 Volt Grind’n Brew units require a 20 Amp circuit.  
1. Plug the brewer into an electrical outlet (or run power to unit for hardwire applications).  
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. (Cut that time in half for  
the 230V “Q” models.) Once the Ready light is lit, you are ready to brew.  
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.  
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.  
Bean Selector  
(Dual Bean Models Only)  
Half or Full Pot  
Grind only  
Brew only  
Grind and Brew Option  
Figure B  
(Dual Bean Model)  
(Single Bean Model)  
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.  
Page 6  
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). 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 and half that time  
for 230V machines. 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.  
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.  
10 Pin Version  
Locked  
User  
Lockout  
Jumper  
1
LOCK  
Unlocked  
1
LOCK  
2 Pin Version  
Locked  
LOCK  
Unlocked  
LOCK  
User Lockout Jumper  
Grind’n Brew® Coffee Systems  
Page 7  
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.  
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.  
User Settings  
Universal Settings  
Temperature Scale  
Brew Settings x 4  
Auger Time  
Water Temperature  
Low Temp No Brew Enable  
Pulse Brew Pulses  
Pulse Brew Pour Time  
Pulse Brew Delay Time  
Brew Time  
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.  
Page 8  
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  
below shows how to step through this menu.  
Step Setting  
Display  
Adjustments  
1
2
3
4
5
6
Temperature Scale between  
Displays the current  
selection. Factory default  
is “°F”  
“°F” or “°C”  
°F or °C  
Water Temperature  
setpoint in °F or °C  
Displays the current  
“170” to “205” °F  
“77” to “96” °C  
selection. Factory default is  
“195” in °F or “91” in °C.  
Show Auger Time  
the amount of coffee beans fed  
into the grinder  
Set Auger Time  
the amount of coffee beans fed selection depending on Brew  
into the grinder  
Show Brew Time  
Total amount of pour time for  
the brew cycle  
Set Brew Time  
Total amount of pour time for  
the brew cycle  
“At”  
None  
Displays the current  
“0.1” to “45.0” seconds  
None  
Cycle  
“br”  
Displays the current  
selection depending on Brew  
Cycle  
“0.01” to “6.00” in min-  
utes.seconds  
7
8
Show Pulse Brew  
“P-b”  
None  
Pulse Brew Pulse Number  
sets the number of pulses in  
the brew cycle  
Displays the current  
selection depending on Brew  
Cycle  
“OFF” to “10”  
9
Pulse Brew Pour Time  
Displays the current  
“0.05” to “1.00” in  
minutes.seconds  
sets the amount of pour time in selection depending on Brew  
each pulse  
10 Pulse Brew Delay Time  
Cycle  
Displays the current  
“0.05” to “1.00” in min-  
utes.seconds  
sets the amount of delay time selection depending on Brew  
between each pulse  
Cycle  
11 Show Low Temp No Brew  
“Ltn”  
None  
12 Set Low Temp No Brew  
Displays the current  
selection. Factory default  
is “YES”  
“OFF” or “ON”  
enable or disable  
Grind’n Brew® Coffee Systems  
Page 9  
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.  
Page 10  
Grind’n Brew® Coffee Systems  
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  
1
2
3
4
LED Test  
All LEDs ON  
Verify that all LEDs turn on.  
Firmware Version  
Date Code  
Display firmware version  
Shows the software version of the control.  
Not used with Grind’n Brew®  
Display date code/serial ID  
Scroll non-resetable bean counter  
Non Resetable Bean  
Counter  
Shows the total number of seconds the  
grinder has been grinding (non-resetable)  
5
Configuration Inputs  
Each digit of the display corresponds to a Highest Digit (left most):  
configuration input. The input is either  
“0” - disabled or “1” - enabled.  
“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  
6
7
Display Water  
Temperature  
Show averaged A/D reading of temperature Show the current temperature in °F of the  
thermistor  
Display Water Level 1  
Show averaged A/D reading of water level 1 If > 500 water level full,  
If < 500 water level not full  
8
9
Display Water Level 2  
Show Input  
Show averaged A/D reading of water level 2 Not used with Grind’n Brew®  
Display scrolls “InPut”  
Input Test Mode  
10  
Input Test  
Press each key and the display will show a Hopper Button: 12  
number related to that key  
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  
12  
Show Output  
Output Test  
Display scrolls “outPut”  
Output Test Mode  
Turns on each relay separately. Displays  
“O##“ where:  
## = 2 digit output number  
Scroll through relay outputs with the UP  
and DOWN keys. Outputs are as follows:  
O01: Fill Valve  
IMPORTANT: Each output will be turned O02: Brew Valve  
ON when its number is on the display  
REGARDLESS of temperature or fill  
level. Be CAREFUL not to overfill the  
O03: Grind Shutter  
O04: Left Auger Motor  
O05: Right Auger Motor  
tank and keep electric items out of the O06: not used  
way of the brew channel.  
O07: Heater  
O08: Grinder Motor  
O09: Basket Out Light  
O10: Ready Light  
Grind’n Brew® Coffee Systems  
Page 11  
Water System Errors  
There are three 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) – the Thermistor is detected either open, shorted OR the water is boiling.  
3.Heater Error (Er3) – 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.  
Timer Settings  
A standard 64 oz. bottle Grind’n Brew  
All Airpot Grind’n Brews  
Setting  
Single Bean  
Approx.  
yield  
Setting  
Dual Bean  
Approx.  
yield  
Setting  
Single Bean  
Approx.  
yield  
Setting  
Dual Bean  
Approx.  
yield  
Single/Left Full Pot 4.2 sec.  
2 oz.  
-
1.25 oz.  
-
62 fl oz.  
31 fl oz.  
5.7 sec.  
5.7 sec.  
3.0 sec.  
3.0 sec.  
112-125 sec.  
56-63 sec.  
2 oz.  
2 oz.  
1.25 oz.  
1.25 oz.  
62 fl oz.  
31 fl oz.  
Single/Left Full Pot 4.5 sec.  
2.3 oz.  
-
1.4 oz.  
-
72 fl oz.  
36 fl oz.  
6.2 sec.  
6.2 sec.  
3.7 sec.  
3.7 sec.  
140-153 sec.  
70-77 sec.  
2.3 oz.  
2.3 oz.  
1.4 oz.  
1.4 oz.  
72 fl oz.  
36 fl oz.  
Right Full Pot  
-
Right Full Pot  
-
Single/Left Half Pot 2.4 sec.  
Single/Left Half Pot 2.7 sec.  
Right Full Pot  
Full Pot  
Half Pot  
-
Right Full Pot  
Full Pot  
Half Pot  
-
112-125 sec.  
56-63 sec.  
140-153 sec.  
70-77 sec.  
• 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 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.  
Figure C  
Page 12  
Grind’n Brew® Coffee Systems  
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 (Refer to Figure D)  
Slide Valve: The slide valve behind the spray deflec-  
tor under the cabinet hood should be wiped off with  
a clean, dry cloth. Using the finger tab open the slide  
valve and wipe the ground coffee from inside of the  
spout, seal and slide valve.  
NOTE: When the machine is not in use, the finger  
tab will automatically activate every 60  
minutes to keep clear.  
Brew Basket, Airpots and Decanters: Use com-  
mercial grade urn cleaner (as directed by manufac-  
turer) and rinse thoroughly.  
Figure D  
Grind’n Brew® Coffee Systems  
Page 13  
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. There are 5 screws (2 in front and 3  
across the back) holding the hopper cradle in place.  
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.  
.
Page 14  
Grind’n Brew® Coffee Systems  
Troubleshooting Guide  
The following procedures must be performed by a qualified service technician.  
CAUTION: Unplug power cord from outlet before cleaning or servicing the unit.  
Problem  
Possible Cause  
Remedy  
Weak coffee  
• Not enough coffee used  
• Grind is too coarse  
• Set to portion more coffee.  
• Readjust grind to a finer grind.  
• Check spray temp, should be  
greater than 185°F.  
• Water not hot enough  
Too much water used (half brews)  
• Coffee bed has dry areas  
• Adjust brew time at the controller.  
• Spray deflector broken or missing.  
Replace.  
Strong coffee  
Bitter coffee  
Grounds in coffee  
Too much coffee used  
• Grind is too fine  
• Readjust coffee portion.  
• Coarsen grind setting.  
• Use proper filter.  
• Paper filter collapsed during  
brewing  
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 • Main power switch turned off  
button is pushed  
• 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.  
• No power to outlet  
• Basket out  
• Circuit breaker has tripped  
• Basket has not been changed  
Grinder runs or hums but no  
coffee is dispensed  
• Shear disc is broken  
• Replace shear disc. See Shear  
Disc Replacement section.  
• Remove hopper and clear  
obstruction.  
• Obstruction in opening of auger  
assembly (on dual bean units)  
• Obstruction in opening to grinding  
chamber  
• Remove hopper and clean  
obstruction.  
• Check for free operation of slide valve.  
Adjust solenoid mount or slide valve  
mount as required. Make sure white  
slide valve gasket is not touching  
moving parts.  
• Check for blown fuse and replace  
with 5 Amp fuse.  
• Slide valve is bending  
• Blown fuse on controller board  
(Dual bean only)  
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.  
• Slide valve is binding  
• Check for free operation of slide  
valve. Adjust solenoid mount or  
slide valve mount as required.  
Make sure white slide valve gasket  
is not touching moving parts.  
Grind’n Brew® Coffee Systems  
Page 15  
Troubleshooting Guide (cont.)  
Problem  
Possible Cause  
Remedy  
Circuit breaker continuously  
trips  
• Insufficient current due to use of  
extension cord  
• Plug unit directly into outlet. Do not use  
extension cord.  
• Insufficient current due to  
overloaded line  
• Designate single line for unit. Do not  
use multi outlet box.  
Basket Out light flashing  
• Water fill valve on too long  
• Clean or replace water fill valve.  
• Turn water supply on.  
(Display board displays “ER1”) • Water supply turned off  
Basket Out light flashing  
• Problem with Thermistor  
• Replace if defective.  
(Display board displays “ER2”)  
Basket Out light flashing  
• Heater Relay failed  
• Replace defective component  
(Display board displays “ER3”) • Contactor Failed  
• Heater Failed open  
• Hi Temp failed  
• Control Board output failed  
Water not hot enough  
• Thermistor not set high enough  
• Adjust potentiometer  
Water boiling (or steaming)  
• Thermistor set too high  
• Defective Thermistor  
• Adjust potentiometer.  
• Replace Thermistor.  
Start switch not working  
• Brew basket out of place  
• Replace basket.  
(Basket Out light illuminated)  
No lights are on  
• No power to brewer  
• Power switch turned Off  
• Turn power on.  
• Turn switch on.  
(Including Warmer light)  
No touch pad lights  
(other lights o.k.)  
Touch pad disconnected  
• Reconnect touch pad.  
Too much or not enough water • Water time adjustment  
• Readjust.  
in decanter  
Spray head dripping  
• Lime build up in dump valve  
• Faulty seal  
• Delime unit.  
Hot water spigot dripping  
• Replace seal.  
Hot water spigot not dispens- • Drain tube limed-up  
• Delime tank and drain tube.  
• Replace seat.  
ing  
• Defective valve 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,  
shutter 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 black wire to + terminal of  
LED.  
• Replace LED.  
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.  
Page 16  
Grind’n Brew® Coffee Systems  
Exploded View Grind’n Brew Assembly  
Grind’n Brew® Coffee Systems  
Page 17  
Mounting Sheet Assembly  
Warmer Assembly  
Basket Arm Assembly  
Page 18  
Grind’n Brew® Coffee Systems  
Exploded View Hot Water Tank Assembly  
1
2
3
4
5
6
7
8
9
61762  
61128  
71147  
61773  
70635  
71129  
82116  
71084  
71166  
61626  
71375  
PLUG, 5/8" HOLE  
PROBE, THERMISTOR 12" LG.  
GROMMET, PROBE  
COVER, TANK PIC 1  
FASTON TAB, 1/4" X 0.032"  
NUT, 8-32 KEPS S/S  
BRACKET, TANK  
SCREW, 8-32 X 1/2" S/S  
NUT, TINNERMAN 8-32 S/S  
ELEMENT, HEATING 1650 W/ 120V  
ELEMENT, HEATING 3500 W/ 240V  
THERMODISC, BRACKET  
THERMODISC  
10  
11 70824  
12 70410  
13 61317  
14 61143  
15 07327  
16 05826  
17 71148  
18 61108  
19 70821  
20 61700  
21 61243  
22 61229  
23 71155  
24 71258  
25 70341  
26 12152  
27 71093  
28 71155  
29 61237  
30 71155  
31 61104  
32 71129  
33 05826  
34 61152  
35 05826  
36 61232  
37 05826  
38 82119  
39 61102  
FITTING 1/8" NPT MF 3/8" BARB  
NUT, PIPE JAM 1/8" NPT  
CLAMP, HOSE 5/8"  
TUBING, 3/8" I.D X 20" LG. SILICONE  
VENT TUBE SUPPORT  
WATER LEVEL PROBE  
GASKET, WATER TANK  
TANK 16" WATER  
GROMMET, DUMP VALVE  
GROMMET, PLUG  
TUBING, 5/16" I.D X 2" LG. SILICONE  
SPRAY TUBE S/S  
FITTING, 90 DEGREE ELBOW-SILICONE  
SIPHON TUBE  
TUBE SPLICE  
TUBING, 5/16" I.D X 9 1/2" LG. SILICONE  
FITTING, HOSE TO 1/4" FLARE SWIVEL  
TUBING, 5/16" I.D X 1" LG. SILICONE  
WATER FILL VALVE 120 VAC  
NUT, 8-32 KEPS S/S  
TUBING, 3/8" I.D X 7 1/2" LG. SILICONE  
TEE, 7/16" X 7/16" X 7/16" BARBED  
TUBING, 3/8" I.D X 11" LG. SILICONE  
PLUG, 3/8" BARBED DRAIN  
TUBING, 3/8" I.D X 16" LG. SILICONE  
PANEL, SERVICE  
DUMP VALVE - 120 VAC  
Grind’n Brew® Coffee Systems  
Page 19  
Exploded View Grinder Assembly  
Page 20  
Grind’n Brew® Coffee Systems  
Single Bean Upper Assembly  
Dual Bean Upper Assembly  
Grind’n Brew® Coffee Systems  
Page 21  
Wiring Diagram 115/230V, 60Hz  
Page 22  
Grind’n Brew® Coffee Systems  
Tel (502) 425-4776 • Fax (502) 425-4664 • 1-800-695-4500 (USA & Canada only)  
P.O. Box 35020 • Louisville, KY 40232 • USA  
© Grindmaster Corporation, 1997  
PRINTED IN USA  
1008 Form # BW-350-14  
Part #70661  

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