Bunn U3A - Manual (Page 8)

Page 8
PROBLEM
Brew cycle will not start
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage to
the brewer
3. Water level below pump housing.
(Water level in the hot water gauge
glass should be approximately half
full).
4. Swing Arm Switch
5. ON/OFF Switch
REMEDY
Water lines and valves to the brewer
must be open.
(A) Check the terminal block for 230
volts ac across the red and black
terminals.
(B) Check the fuse.
Be sure water shut-off valve is open
and that the in-line filters or strain-
ers are not blocking water flow. (Do
not confuse water shut-off valve with
the manual fill and drain valve un-
derneath the brewer).
Refer to Service - Swing Arm Switch
for testing procedures. See Page 24
Refer to Service - ON/OFF Switch for
testing. See page 19
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 230 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
10060.3 070102