Bunn G1 User Instructions - G1, G2 & G3 Grinders
39565 102506
G1, G2 & G3 GRINDERS
TROUBLESHOOTING
A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered. If the problem remains after
exhausting the troubleshooting steps, contact the Bunn-O-Matic Technical Service Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Disconnect the grinder from the power source when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
Grinder will not start.
Grinder will not shut off.
Grinder starts, but will not dispense.
PROBABLE CAUSE
1. No power or incorrect voltage.
2. Off/On/Start Switch.
3. Bag sensor.
4. Motor overload protector
1. Off/On/Start Switch
2. Bag Sensor
3. Relay
1. Hopper
2. Entrance to grind chamber
3.Shear Plate
REMEDY
(A) Plug-in the grinder.
(B) Check the voltage at the wall outlet with a
voltmeter. It must be 120 volts ac for two wire 120
volt models or 230 volts ac for two wire 230 volt
50 Hz models or 240 volts ac for two wire 240 volt
60 Hz models.
(A) Press the switch to the “START” position.
(B) Refer to Service - Off/On/Start Switch for test-
ing procedures. See page 16.
(A) The receiving bag must be placed on the tray
screen and have the back of the bag behind the
dispense chute to activate the sensor switch.
(B) Refer to Service - Bag Sensor Switch for testing
and adjustment procedures. See page 9.
Remove the plug located on the right side of the
housing. Press the red “Reset” button visible
through the opening. Listen carefully for a “click”.
This resets the motor protection circuit and may
indicate that an overload has been encountered by
the motor. (An overload can occur when something
other than coffee is inserted into the hopper for
grinding. Refer to Service - Motor for disassem-
bly.) See page 10 for AC Motors or see page 13
for DC Motors.
(A) Move the switch to the “OFF” position.
(B) Refer to Service - Off/On/Start Switch for test-
ing procedures. See page 16.
(A) Remove bag from under the dispense chute.
(B) Refer to Service - Bag Sensor Switch for testing
procedures. See page 9.
Refer to Service - Relay for testing procedures.
See page 18.
Coffee must be poured into hopper before grind-
ing.
Foreign materials must not block the opening at
the bottom of the hopper.
Remove both black fillister head screws holding the
grinder selector dial plate to the grinder. Carefully
remove the dial plate and rotor cup. Inspect the
shear plate for wear. Replace if excessively worn
or damaged.