Bunn CWT Service Manual download pdf (Page 8)

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 qualied 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 ttings 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 specied.

• Follow recommended service procedures

• Replace all protective shields or safety notices

PROBLEM

Brew cycle will not start (CT,

CTF, CWT, CWTA, CWTB, CWTF,

CWTFA, CWTFB, SINGLE CW &

SINGLE CWF)

PROBABLE CAUSE

1. No water

2. No power or incorrect voltage

to the brewer

REMEDY

Water lines and valves to the

brewer must be open.

(A1) Check the terminal block for

120 volts across the black and

white terminals on two wire 120

volt brewers.

(A2) Check the terminal block

for 120 volts across the red and

white terminals and the black

and white terminals on three wire

120/240 volt brewers.

(A3) Check the terminal block for

200 volts on "B Series" brewers

or 230 volts on "A Series" brew-

ers across the red and black

terminals.

(B) Check circuit breakers or

fuses.

10841 020503

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Bunn CWT Service Manual Page 8

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