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Page 6
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 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
PROBLEM
Brew cycle will not start
Water is not hot
PROBABLE CAUSE
1. No water
2. No power or incorrect voltage to
the brewer
1. Tank Heater Switch (VP17B and
Early Model VP17)
2. Limit Thermostat
CAUTION - Do not eliminate or
bypass limit thermostat. Use only
replacement part #29329.1000
3. Control Thermostat
REMEDY
Check fill basin for obstructions.
(A1) Be sure the brewer is con-
nected to the power source.
(A2) Check the terminal block for
100 volts on "B Series" brewers
across the white and black termi-
nals.
(B) Check circuit breakers or fuses.
Refer to
Service
- Tank Heater
Switch for testing procedures. See
page 14
Refer to
Service
- Limit Thermo-
stat for testing procedures. See
page 11
Refer to
Service
- Control Thermo-
stat for testing procedures. See
page 10
10860 061501