Troubleshooting - Bunn Silver JDF-4S Installation & Operating Manual

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 120-240 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.
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
Cold Water Circulation
Dispense stations not working.
Note: Cooling failure or excessive
cabinet temperatures for more
than 4 hours will result in dispense
lockout or no dispense.
Note: Reset fault/timer by unplug-
ging unit.
Dispense nozzle dripping/won't stop
dispensing.

TROUBLESHOOTING

PROBABLE CAUSE
1. Cabinet cooling fan.
2. Bath recirculation pump.
3. Restricted water flow to cabinet
water coil and bath.
1. Juice residue causing o-ring on
dispense nozzle to lose vacuum.
2. Mechanical Switch Models- This
may be caused by juice residue
splashed or wiped onto switches.
3. Membrane Switch Models-
21
REMEDY
Replace fan (24vdc).
Note: Fan receives power when the
dispenser is powered.
A) If not running, check refrigera-
tion switch and wiring for proper
continuity.
B) Check for 120V or 230V AC at
pump. Replace pump.
Check for kinked hose.
A) Remove dispense nozzle. Clean
nozzles and o-ring in mild detergent
solution.
B) Use soft bristle brush and mild
detergent solution to clean dispense
valve area that dispense nozzles are
seated.
Clean or replace switches.
Check continuity of dispense
switches. Replace as needed.
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