Troubleshooting - Bunn TU3QF-EZ Operating & Service Manual

ADJUSTING BREW VOLUMES (CONT.)
BREW VOLUME SETUP: Use the following steps when the setting is unknown or a different circuit board is being
installed.
1. Place a funnel in the funnel rails and an empty container of at least four gallons beneath the funnel.
2. Turn ON the brewer.
3. Press and hold the brew start switch until you hear the brew solenoid click on-and-off three times (approxi-
mately 5 seconds). Release the switch.
4. Allow the cycle to continue until the desired amount of water is dispensed and then turn OFF the brewer.
The brewer is now set to dispense this amount of water for each subsequent brew cycle.
SANITIZE VOLUME: Use the above procedure substituting the sanitize switch for the brew start switch. The
volume for the sanitize function is set for 3 gallons.
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 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 brewer is heated at all times. Keep away from combustibles.
WARNING – • Exercise extreme caution when servicing electrical equipment.
• Unplug the brewer when servicing, except when electrical tests are specified.
• Follow recommended service procedures.
• Replace all protective shields or safety notices.
Before troubleshooting this brewer, check for the following:
Before servicing the brewer, make sure that voltage is present at control board. Check for voltage across pins
1 & 7 of the eight pin J1 connector (black and white wires). If voltage is present, proceed with testing. If
voltage is not present, check wiring and voltage at socket. Correct the problem and retest before proceeding
with testing.

TROUBLESHOOTING

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