Bunn FMD DBC-3 Operating & Service Manual page 9

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, 230 volt or 240 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.
• Solenoid removal requires interrupting the water supply to the valve. Damage may result if solenoids are
energized for more than ten minutes without a supply of water.
• The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened. This will help
to avoid twists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and isolated.
• This unit is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the dispenser when servicing, except when electrical tests are specified.
• Follow recommended service procedures
• Replace all protective shields or safety notices
PROBLEM
Product will not dispense
TROUBLESHOOTING
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage to
the dispenser
3. Digital Touch Control Switch
9
REMEDY
Water lines and valves to the
dispenser must be open.
(A1) Check for 120 volts across the
black and white wires on two wire
120 volt dispensers.
(A2) Check for 120 volts across the
red and white wires and the black
and white wires, 208 volts across
the red and black wires on three wire
120/208 volt dispensers and 240
volts across the red and black wires
on 120/240 volt dispensers.
(A3) Check for 240 volts across the
white and black wires on two wire
240 volt dispenser.
(A4) Check for 230 volts across the
white and black wires on two wire
230 volt dispensers.
(B) Check circuit breakers or
fuses.
Refer to Service - Digital Touch
Control Switch for testing proce-
dure. See page 26
29215 052104