Troubleshooting - Bunn G9WD-RH Installation & Operating 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 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 specified.
• Follow recommended service procedures.
• Replace all protective shields or safety notices.
Problem
Grinder will not start
RELEASED FOR PRODUCTION
Probable Cause
1. Motor overload protector
2. No power
3. START button
4. Circuit board
DIR Num: 41451.0001
Remedy
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.
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25, November 2014
41451.0001 111909