Troubleshooting - Bunn G9 HD Operating & Service Manual

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 per-
sonnel.
• 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.
Problem
Grinder will not start.
Probable Cause
1. Motor overload protector
2. No power or incorrect voltage
3. Off/On/Start switch
Page 6
Remedy
Remove the cover plate located
on the right side of the housing.
Press the red "Reset" button. Listen
carefully for a "click". This resets
the motor protection circuit and
indicates that an overload 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 - Motor for disassembly
procedures. See page 9.
Check the voltage at the power cord
with a voltmeter. Voltage must be:
(A) 120 volts across the black and
white wires for 120 volt models.
(B) 240 volts across the black
and red/black wires for 240 volt
models.
(A) Momentarily place the switch in
the "START" (right) position.
(B) Refer to Service - Off/On/Start
Switch for testing procedures. See
page 11.
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