Bunn WDG-2 manual Troubleshooting, Problem Probable Cause Grinder will not start

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.

Problem	Probable Cause
Grinder will not start.	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

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.

11 10854 030300