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Problem
Grinder will not start.
Remedy
(A) Plug-in the grinder.
(B) Check the voltage at the wall
outlet with a voltmeter. It must
be 120 volts ac.
(A) Momentarily press the Off/On/Start
switch to the “START” (lower) position.
(B) Refer to
Service
- Off/On/Start
switch for testing procedures. See page
13.
Refer to
Service
- Timer for testing pro-
cedures. See page 16.
Refer to
Service
- Weight Control Board
for testing procedures. See page 18.
Remove Grinder rear cover. Press the
red “Reset” button, one located on rear
of each motor. Listen carefully for a
“click”. This resets the motor protec-
tion circuit and indicates that an over-
load may have been encountered by the
motor. (An overload can occur when
something other than coffee is inserted
into the hopper for grinding.) Refer to
Service -
Motors for disassembly pro-
cedures. See page 14.
Probable Cause
1. No power or incorrect voltage
2. Off/On/Start switch
3. (A) Timer - DG-2
(B) Weigh Control Board WDG-2
4. Motor overload protector
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.
• All electronic components have 120 volt ac and low voltage dc potential on their terminals.
Shorting of terminals or the application of external voltages may result in board failure.
• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be
permanent. If 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 specified.
• Follow recommended service procedures.
• Replace all protective shields or safety notices.
10854 030300