Bunn DUAL - User Notices and Electrical Requirements; General Safety Warnings; Electrical and Water Safety Precautions; Electrical Requirements for Service

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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 qualied
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ttings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thebrewerfromthe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.
Probable Cause
1. No power or incorrect voltage.
1. No water
2. Water strainer/flow control
(.750 GPM)
Remedy
(A1) Check the terminal block for
120 volts across the red and white
terminals and the black and white
terminals on 120V, 120/208 or
120/240 volt brewers.
(A2) 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.
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