Coffee Grinder User Manual

13
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qualiedserviceperson-
nel.
• Allelectroniccomponentshave120voltsacandlowvoltagedcpotentialontheirterminals.Shortingof
terminals or the application of external voltage may result in board failure.
• Intermittentoperationofelectroniccircuitboardsisunlikely.Boardfailurewillnormallybepermanent.Of
an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection at a
terminal or crimp.
• Makecertainthatallelectricalconnectionsaretightandisolated.
WARNING
• Exerciseextremecautionwhenservicingelectricalequipment.
• TurnpowerOFFwhenservicing,exceptwhenelectricaltestsarespecied.
• Followrecommendedserviceprocedures.
• Replaceallprotectiveshieldsorsafetynotices.
Problem Probable Cause Remedy
Grinder will not start 1. Motor overload protector
2. No power
3. START button
4. Circuit board
Remove the metal plug located
on the right side of the housing.
Press the red “Reset” button. Lis-
ten carefully for a “click”. This re-
sets the motor protection circuit
and indicates that the motor may
have encountered an overload. (An
overload can occur when some-
thing other than coffee is inserted
into the hopper for grinding)
Check the voltage at the power cord
with a voltmeter. Voltage must be
120 volts across the black and
white wires.
Use “TEST SWITCHES?” menu
under “SERVICE TOOLS?” menu
in level 1 functions to test START
button.
Circuit board. Check that there is
24VDC to the relay coil when the
Start button is pressed.
41451.0001 111909