Bunn Single Operating & Service Manual page 8

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 - 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 per-
manent. 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 sole-
noids 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 avoid twists and kinks in the tubing.
• Make certain that all plumbing connections are sealed and electrical connections tight and iso-
lated.
• This brewer is heated at all times. Keep away from combustibles.
WARNING
• Exercise extreme caution when servicing electrical equipment.
• Disconnect power source when servicing, except when electrical tests are specified.
• Follow recommended service procedures.
• Replace all protective shields or safety notices.
Problem
Equipment will not operate. Brew
cycle will not start.
Brew cycle will not start.
Probable Cause
1. No power or incorrect voltage
1. No water
2. Water strainer/flow control (.330
GPM)
Page 8
Remedy
(A1) Check the terminal block for
120 volts across the black and
white terminals on 120 volt two wire
brewers.
(A2) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminals on 120/208 or 120/240
volt brewers.
(A3) Check the terminal block for 200
volts on "B Series" brewers or 240
volts on "A Series" brewers across
the red and black terminals.
(B) Check circuit breakers or
fuses.
Check plumbing and shut-off
valves
(A) Direction of flow arrow must be
pointing towards brewer.
(B) Remove the strainer/flow control
and check for obstructions. Clear or
replace.
27038 091900