Troubleshooting Guide - Bunn Fast Cup Series Service & Repair Manual

TROUBLESHOOTING
A Problem Reference Guide that includes Machine Messages, Symptoms and Active Notice Events is provided to
suggest Probable Causes and Tests/Remedies for problems encountered. In the event of a machine problem, power
cycle the machine and see if the machine resets back into operation. If a problem persists and after exhausting the
probable causes and remedies, contact the Bunn-O-Matic Technical Support Department.
• Inspection, testing, and repair of electrical equipment should be performed only by qualified service personnel.
• All electronic components have high voltage ac and low voltage dc potential on their terminals. Shorting of ter-
minals 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 in-
termittent 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.
• Ensure drain line is routed properly through counter with the use of a 90° elbow to help prevent tubing from
kinks or bending upwards.
• This unit is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the machine when servicing, except when electrical tests are specified.
• Exercise extreme caution, machine contains moving parts.
• Damaged protective shields and/or safety notices should be replaced.
TROUBLESHOOTING
MACHINE MESSAGES, SYMP-
TOMS and/or ACTIVE NOTICES
Messages
1. Check Left, Center or Right Hopper-
Out of Beans
2. Check Left, Center or Right Hopper-
Not Detected, Brewing Disabled
PROBABLE CAUSE
a. Hopper truly empty
b. Beans bridging in hopper
c. Sensor (Transmitter/Receiver)
a. Hopper not in position
b. Magnet strength could be weak
c. Failed hopper detect switch
5
REMEDY
a. Refill hopper
b. Remove and empty hopper,
dry and refill hopper
c. Technician to test sensors by follow-
ing the test instruction outlined in the
Service Manual
a. Install hopper & detected/not detected
operation can be viewed under the Ser-
vice icon/Sensor tab
b. Try another hopper will determine
if hopper will need to be replaced or
machine has a potentially failed hopper
detect switch
c. Technician to test hopper detect switch
by following the test instruction outlined
in the Service Manual
Continued >
clean,